Reverse battery protection device and operating method thereof

ABSTRACT

A wearable device includes: a touch screen; an acceleration sensor configured to generate an acceleration signal; an optical sensor using a light source and configured to generate a touch interrupt signal; and a control unit configured to detect a wearing state of the wearable device, the wearing state of the wearable device including a not-wearing state for the wearable device, a wrist wearing state, and a hand gripping state on the basis of the acceleration signal and the touch interrupt signal, and to execute a function corresponding to the wearing state of the wearable device.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application a continuation of U.S. application Ser. No. 15/670,804,filed on Aug. 7, 2017, now U.S. Pat. No. 10,088,807, which is acontinuation of U.S. application Ser. No. 15/208,491, filed on Jul. 12,2016, now U.S. Pat. No. 9,772,605, which is a continuation of U.S.application Ser. No. 14/872,852, filed on Oct. 1, 2015, now U.S. Pat.No. 9,891,590, which claims the benefit of earlier filing date and rightof priority to Korean Patent Application No. 10-2014-0135746, filed onOct. 8, 2014, the contents of which are all hereby incorporated byreference herein in their entirety.

BACKGROUND

The present disclosure relates to a wearable device for furthermaximizing the user's convenience.

Functions of the mobile terminals become diversified. Mobile terminalsmay include devices being worn on a user's body, neck, head, or wrist inaddition to devices being gripped by a user's hand like mobile phones.Such a device that is wearable by a user is called a wearable device.

As an example of a wearable device, there is a neckband-type device wornon a user's neck, a headset-type device worn on a user's head, or awatch-type device worn on a user's wrist.

For example, a mobile terminal may have functions such as data and voicecommunication, picture and video capturing through a camera, voicerecording, music file playback through a speaker system, and image orvideo output to a display unit. Mobile terminals may further include anelectronic game play function or may perform a multimedia playerfunction. Especially, recent mobile terminals may receive multicastsignals for providing visual contents such as broadcast programs andvideos.

As functions of a terminal are diversified, such a terminal may beimplemented in a form of a multimedia player with multi-functions, forexample, photo or video capturing, playback of music or video files,game plays, and broadcast reception.

Moreover, a watch-type device may be usually used as a watch and ifnecessary, may implement various functions mentioned above, and itsweight is light. Furthermore, since a watch-type device has functionsthat are mostly linked with a mobile phone and there are more rooms toabsorb most of the functions of the mobile phone, it is expected forwatch-type devices to replace mobile phones and accordingly, research tocommercialization for the watch type devices are being actively inprogress.

However, various function implementations or user interfaceimplementations for watch type devices are not widely developed so thatthere are limitations in commercialization.

Especially, a user interface depending on whether a watch-type device isworn is not yet implemented.

SUMMARY

Embodiments provide a wearable device for improving user's conveniencewith the implementation of a user interface depending on whether a userwears it.

Embodiments also provide a wearable device for improving user'sconvenience by varying a security degree depending on whether a userwears it.

Embodiments also provide a wearable device for improving productreliability by improving the detection performance of a heartbeat sensorused for detecting whether a user wears it.

In one embodiment, a wearable device includes: a touch screen; anacceleration sensor configured to generate an acceleration signal; anoptical sensor using a light source and configured to generate a touchinterrupt signal; and a control unit configured to detect a wearingstate of the wearable device, the wearing state of the wearable deviceincluding a not-wearing state for the wearable device, a wrist wearingstate, and a hand gripping state on the basis of the acceleration signaland the touch interrupt signal, and execute a function corresponding tothe wearing state of the wearable device. The control unit isconfigured, when the wearable device is in a not-wearing state, toexecutes a function in the not-wearing state, when the wearable deviceis in a wrist wearing state, to executes a function in the wrist wearingstate, and when the wearable device is in the hand gripping state, toexecutes a function in the hand gripping state. The control unit isconfigured to control the touch screen to display a black screen or anambient screen as the function in the hand gripping state.

In another embodiment, provided is a control method of a wearabledevice. The method includes: detecting a wearing state of the wearabledevice, the wearing state including a not-wearing state for the wearabledevice, a wrist wearing state, and a hand gripping state on the basis ofan acceleration signal and a touch interrupt signal; and executing afunction corresponding to the wearing state of the wearable device,wherein the executing of the function includes: when the wearable deviceis in a not-wearing state, executing a function in the not-wearingstate; when the wearable device is in a wrist wearing state, executing afunction in the wrist wearing state; and when the wearable device is inthe hand gripping state, executing a function in the hand grippingstate, wherein a black screen or an ambient screen is displayed on atouch screen as a function in the hand gripping state.

The details of one or more embodiments are set forth in the accompanyingdrawings and the description below. Other features will be apparent fromthe description and drawings, and from the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram illustrating a watch-type device.

FIG. 2A and FIG. 2B are conceptual diagrams when a watch type device isseen in different directions according to an embodiment of the presentinvention.

FIG. 3 is a view illustrating the principle of a heartbeat sensor.

FIG. 4 is a view illustrating a skin penetration rate according towavelength.

FIG. 5 is a sectional view illustrating a structure of a typicalheartbeat sensor.

FIGS. 6A, 6B and 6C are views illustrating a heartbeat sensor accordingto a first embodiment of the present invention.

FIGS. 7A and 7B are views illustrating a first layer in the heartbeatsensor of FIG. 6.

FIG. 8 is a view illustrating a heartbeat sensor according to a secondembodiment of the present invention.

FIG. 9 is a view illustrating a heartbeat sensor according to a thirdembodiment of the present invention.

FIG. 10 is a view illustrating a heartbeat sensor according to a fourthembodiment of the present invention.

FIG. 11 is a view illustrating a heartbeat sensor according to a fifthembodiment of the present invention.

FIGS. 12A and 12B are views illustrating a heartbeat sensor according toa sixth embodiment of the present invention.

FIG. 13 is a view illustrating a heartbeat sensor according to a seventhembodiment of the present invention.

FIG. 14 is a view illustrating a waveform of a touch interrupt signalgenerated from a heartbeat sensor.

FIG. 15 is a flowchart illustrating a method of detecting whether awatch type device is worn according to an embodiment of the presentinvention.

FIGS. 16A, 16B and 16C are views illustrating a screen type.

FIG. 17 is a flowchart illustrating a method of detecting a not-wearingstate of the watch type device of FIG. 15 according to an embodiment ofthe present invention.

FIG. 18 is a flowchart illustrating a method of detecting a wearingstate of the watch type device of FIG. 15 according to an embodiment ofthe present invention.

FIG. 19 is a flowchart illustrating a method of operating a heartbeatsensor depending on whether a watch type device is worn according to anembodiment of the present invention.

FIGS. 20A and 20B are views illustrating a tilt when a watch type deviceis worn on a wrist and gripped by a hand.

FIG. 21 is a flowchart illustrating a lock releasing method depending onwhether a watch type device is worn according to an embodiment of thepresent invention.

FIGS. 22A and 22B are screen views illustrating a method of changing ablack screen into a standby screen.

FIG. 23 is a view illustrating the detection amount of a touch interruptsignal according to race.

FIG. 24 is a flowchart illustrating a heartbeat measurement methodaccording to a skin in a watch type device according to an embodiment ofthe present invention.

FIGS. 25A, 25B, 25C and 25D are screen views according a detailedsetting of wearing detection.

FIGS. 26A, 26B and 26C are screen views illustrating a message checkingmethod in a hand gripping state.

FIGS. 27A, 27B, 27C and 27D are screen views illustrating a messagechecking method in a wrist wearing state.

FIG. 28 is a screen view illustrating a setting screen displaying methodin a wearing state.

FIGS. 29A and 29B are screen views illustrating a method of setting heatdisplayed on a setting screen in a wearing state.

FIG. 30 is a graph obtained by measuring a heating temperature at eachof the front and rear of a watch type device.

FIGS. 31A and 31B are screen views illustrating a pop-up messagenotifying method according to heating temperature.

FIGS. 32A, 32B and 32C are screen views illustrating a method ofchanging the background color of a screen according to a heatingtemperature.

FIGS. 33A, 33B and 33C are screen views illustrating a method ofchanging the color of an indicator displayed on a screen according to aheating temperature.

FIGS. 34A and 34B are screen views illustrating a method of lowering aheating temperature according to a heat control set in FIG. 29.

FIG. 35 is a screen view illustrating a method of setting securitydisplayed on a setting screen in a wearing state.

FIG. 36 is a screen view illustrating a subsequent setting method whenKnock On is selected in FIG. 35.

FIG. 37 is a flowchart illustrating a screen activating method and alock releasing method according to wearing.

FIG. 38 is another flowchart illustrating a screen activating method anda lock releasing method according to wearing.

FIGS. 39A and 39B are screen views illustrating a method of releasinglock by using a heartbeat signal.

FIGS. 40A, 40B, 40C and 40D are screen views illustrating a method ofutilizing a knock code gesture.

FIGS. 41A, 41B, 41C, 41D and 41E are screen views illustrating a methodof changing dials in a wearing state.

FIG. 42 is a screen view illustrating a method of setting connectivityaccording to a wearing state.

FIG. 43 is a screen view illustrating a screen displaying method when awatch type device is taken off.

FIG. 44 is another screen view illustrating a screen displaying methodwhen a watch type device is taken off.

FIGS. 45A, 45B, 45C and 45D are views illustrating a method of updatingan update item manually.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Hereinafter, embodiments of the present invention are described in moredetail with reference to accompanying drawings and regardless of thedrawings symbols, same or similar components are assigned with the samereference numerals and thus overlapping descriptions for those areomitted. The suffixes “module” and “unit” for components used in thedescription below are assigned or mixed in consideration of easiness inwriting the specification and, do not have distinctive meanings or rolesby themselves. In the following description, detailed descriptions ofwell-known functions or constructions will be omitted since they wouldobscure the invention in unnecessary detail. Additionally, theaccompanying drawings are used to help easily understanding embodimentsdisclosed herein but the technical idea of the present invention is notlimited thereto. It should be understood that all of variations,equivalents or substitutes contained in the concept and technical scopeof the present invention are also included.

It will be understood that the terms “first” and “second” are usedherein to describe various components but these components should not belimited by these terms. These terms are used only to distinguish onecomponent from other components.

In this disclosure below, when one part (or element, device, etc.) isreferred to as being ‘connected’ to another part (or element, device,etc.), it should be understood that the former can be ‘directlyconnected’ to the latter, or ‘electrically connected’ to the latter viaan intervening part (or element, device, etc.). It will be furtherunderstood that when one component is referred to as being ‘directlyconnected’ or ‘directly linked’ to another component, it means that nointervening component is present.

The terms of a singular form may include plural forms unless they have aclearly different meaning in the context.

Additionally, in this specification, the meaning of “include,”“comprise,” “including,” or “comprising,” specifies a property, aregion, a fixed number, a step, a process, an element and/or a componentbut does not exclude other properties, regions, fixed numbers, steps,processes, elements and/or components.

FIG. 1 is a block diagram illustrating a watch-type device.

Referring to FIG. 1, the watch type device 100 may include a wirelesscommunication unit 110, an input unit 120, a sensing unit 140, an outputunit 150, an interface unit 160, a memory 170, a control unit 180, and apower supply unit 190. In implementing a watch type device, componentsshown in FIG. 1 are not necessary, so that a watch type device describedin this specification may include components less or more than thecomponents listed above.

In more detail, the wireless communication unit 110 in the componentsmay include at least one module allowing wireless communication betweenthe watch type device 100 and a wireless communication system, betweenthe watch type device 100 and another watch type device 100, or betweenthe watch type device 100 and an external server. Additionally, thewireless communication unit 110 may include at least one moduleconnecting the watch type device 100 to at least one network.

The wireless communication unit 110 may include at least one of abroadcast receiving module 111, a mobile communication module 112, awireless internet module 113, a short-range communication module 114,and a location information module 115.

The input unit 120 may include a camera 121 or an image input unit forimage signal input, a microphone 122 or an audio input unit for audiosignal input, and a user input unit 123 (for example, a touch key and amechanical key)) for receiving information from a user. Voice data orimage data collected by the input unit 120 are analyzed and processed asa user's control command.

The sensing unit 140 may include at least one sensor for sensing atleast one of information in a watch type device, environmentalinformation around a watch type device, and user information. Forexample, the sensing unit 140 may include at least one of a proximitysensor 141, an illumination sensor 142, an acceleration sensor 143, aheartbeat sensor 144, a touch sensor, a magnetic sensor, a G-sensor, agyroscope sensor, a motion sensor, an RGB sensor, an infrared (IR)sensor, a finger scan sensor, an ultrasonic sensor, an optical sensor(for example, a camera 121), a microphone 122, a battery gauge, anenvironmental sensor (for example, a barometer, a hygrometer, athermometer, a radiation sensor, a thermal sensor, and a gas sensor),and a chemical sensor (for example, an electronic noise, a healthcaresensor, and a biometric sensor). Moreover, a watch type device disclosedin this specification may combines information sensed by at least two ormore sensors among such sensors and may then utilize it.

The output unit 150 is used to generate a visual, auditory, or hapticoutput and may include at least one of a display unit 151, a soundoutput unit 152, a haptic module 153, and an optical output unit 154.The display unit 151 may be formed with a mutual layer structure with atouch sensor or formed integrally, so that a touch screen may beimplemented. Such a touch screen may serve as the user input unit 123providing an input interface between the watch type device 100 and auser and an output interface between the watch type device 100 and auser at the same time.

The interface unit 160 may serve as a path to various kinds of externaldevices connected to the watch type device 100. The interface unit 160may include at least one of a wired/wireless headset port, an externalcharger port, a wired/wireless data port, a memory card port, a portconnecting a device equipped with an identification module, an audioInput/Output (I/O) port, a video I/O port, and an earphone port. Incorrespondence to that an external device is connected to the interfaceunit 160, the watch type device 100 may perform an appropriate controlrelating to the connected external device.

Additionally, the memory 170 may store data supporting various functionsof the watch type device 100. The memory 170 may store a plurality ofapplication programs or applications running on the watch type device100, and data and commands for operations of the watch type device 100.At least part of such an application program may be downloaded from anexternal server through a wireless communication. Additionally, at leastpart of such an application program may be included in the watch typedevice 100 from the time of shipment in order to perform a basicfunction (for example, an incoming call, a calling function, and amessage reception) of the watch type device 100. Moreover, anapplication program may be stored in the memory 170 and installed on thewatch type device 100, so that it may run to perform an operation (or afunction) of the watch type device 100 by the control unit 180.

The control unit 180 may control overall operations of the mobileterminal 100 generally besides an operation relating to the applicationprogram. The control unit 180 may provide appropriate information orfunctions to a user or process them by processing signals, data, andinformation inputted/outputted through the above components or executingapplication programs stored in the memory 170.

Additionally, in order to execute an application program stored in thememory 170, the control unit 180 may control at least part of thecomponents shown in FIG. 1. Furthermore, in order to execute theapplication program, the control unit 180 may combine at least two ofthe components in the watch type device 100 and may then operate it.

The power supply unit 190 may receive external power or internal powerunder a control of the control unit 180 and may then supply power toeach component in the watch type device 100. The power supply unit 190includes a battery and the battery may be a built-in battery or areplaceable battery.

At least part of the each component may operate cooperatively in orderto implement operations, controls, or control methods of a watch typedevice according to various embodiments of the present inventiondescribed below. Additionally, the operations, controls, or controlmethods of a watch type device may be implemented on the mobile terminal100 by executing at least one application program stored in the memory170.

Hereinafter, prior to examining various embodiments implemented throughthe watch type device 100, the above-listed components are described inmore detail with reference to FIG. 1.

First, in describing the wireless communication unit 110, the broadcastreceiving module 111 of the wireless communication unit 110 may receivea broadcast signal and/or broadcast related information from an externalbroadcast management server through a broadcast channel. The broadcastchannel may include a satellite channel and a terrestrial channel. Atleast two broadcast receiving modules for simultaneous broadcastreception for at least two broadcast channels or broadcast channelswitching may be provided to the watch type device 100.

The mobile communication module 112 may transmit/receive a wirelesssignal to/from at least one of a base station, an external terminal, anda server on a mobile communication network established according to thetechnical standards or communication methods for mobile communication(for example, Global System for Mobile communication (GSM), CodeDivision Multi Access (CDMA), Code Division Multi Access 2000(CDMA2000), Enhanced Voice-Data Optimized or Enhanced Voice-Data Only(EV-DO), Wideband CDMA (WCDMA), High Speed Downlink Packet Access(HSDPA), High Speed Uplink Packet Access (HSUPA), Long Term Evolution(LTE), and Long Term Evolution-Advanced (LTE-A)).

The wireless signal may include various types of data according to avoice call signal, a video call signal, or text/multimedia messagetransmission.

The wireless internet module 113 refers to a module for wirelessinternet access and may be built in or external to the watch type device100. The wireless internet module 113 may be configured totransmit/receive a wireless signal in a communication network accordingto wireless internet technologies.

The wireless internet technology may include Wireless LAN (WLAN),Wireless-Fidelity (Wi-Fi), Wi-Fi Direct, Digital Living Network Alliance(DLNA), Wireless Broadband (WiBro), World Interoperability for MicrowaveAccess (WiMAX), High Speed Downlink Packet Access (HSDPA), High SpeedUplink Packet Access (HSUPA), Long Term Evolution (LTE), and Long TermEvolution-Advanced (LTE-A) and the wireless internet module 113transmits/receives data according at least one wireless internettechnology including internet technology not listed above.

The short-range communication module 114 may support short-rangecommunication by using at least one of Bluetooth™, Radio FrequencyIdentification (RFID), Infrared Data Association (IrDA), Ultra Wideband(UWB), ZigBee, Near Field Communication (NFC), Wireless-Fidelity(Wi-Fi), Wi-Fi Direct, and Wireless Universal Serial Bus (USB)technologies. The short-range communication module 114 may supportwireless communication between the watch type device 100 and a wirelesscommunication system, between the watch type device 100 and anotherwatch type device 100 or between networks including the watch typedevice 100 and another watch type device 100 (or an external server)through wireless area networks. The wireless area networks may bewireless personal area networks.

The location information module 115 is a module for obtaining thelocation (or the current location) of a watch type device and itsrepresentative examples include a global positioning system (GPS) moduleor a Wi-Fi module. For example, a watch type device may obtain itslocation by using a signal transmitted from a GPS satellite through theGPS module. As another example, a watch type device may obtain itslocation on the basis of information of a wireless access point (AP)transmitting/receiving a wireless signal to/from the Wi-Fi module,through the Wi-Fi module. If necessary, the position information module115 may perform a function of another module in the wirelesscommunication unit 110 in order to obtain data on the location of awatch type device substitutionally or additionally. The locationinformation module 115 is a module for obtaining the position (or thecurrent position) of a watch type device and is not limited to a moduledirectly calculating and obtaining the position of a watch type device.

Then, the input unit 120 is used for inputting image information (orsignal), audio information (or signal), data, or information inputtedfrom a user and the watch type device 100 may include at least onecamera 121 in order for inputting image information. The camera 121processes image frames such as a still image or a video obtained by animage sensor in a video call mode or a capturing mode. The processedimage frame may be displayed on the display unit 151 or stored in thememory 170. Moreover, a plurality of cameras 121 equipped in the watchtype device 100 may be arranged in a matrix structure and through thecamera 121 having such a matrix structure, a plurality of imageinformation having various angles or focuses may be inputted to thewatch type device 100. Additionally, the plurality of cameras 121 may bearranged in a stereo structure to obtain the left and right images forimplementing a three-dimensional image.

The microphone 122 processes external sound signals as electrical voicedata. The processed voice data may be utilized variously according to afunction (or an application program being executed) being performed inthe watch type device 100. Moreover, various noise canceling algorithmsfor removing noise occurring during the reception of external soundsignals may be implemented in the microphone 122.

The user input unit 123 is to receive information from a user and wheninformation is inputted through the user input unit 123, the controlunit may control an operation of the watch type device 100 to correspondto the inputted information. The user input unit 123 may include amechanical input means (or a mechanical key, for example, a button, adome switch, a jog wheel, and a jog switch at the front, back or side ofthe watch type device 100) and a touch type input means. As one example,a touch type input means may include a virtual key, a soft key, or avisual key, which is displayed on a touch screen through softwareprocessing or may include a touch key disposed at a portion other thanthe touch screen. Moreover, the virtual key or visual key may havevarious forms and may be disposed on a touch screen and for example, mayinclude graphic, text, icon, video, or a combination thereof.

Moreover, the sensing unit 140 may sense at least one of information ina watch type device, environmental information around a watch typedevice, and user information and may then generate a sensing signalcorresponding thereto. On the basis of such a sensing signal, thecontrol unit 180 may control the drive or control of the watch typedevice 100 or may perform data processing, functions, or operationsrelating to an application program installed in the watch type device100. Representative sensors among various sensors included in thesensing unit 140 will be described in more detail.

First, the proximity sensor 141 refers to a sensor detecting whetherthere is an object approaching a predetermined detection surface orwhether there is an object around by using the strength of anelectromagnetic field or infrared, without mechanical contact. Theproximity sensor 141 may disposed in an inner area of a watch typedevice surrounded by the touch screen or around the touch screen.

Examples of the proximity sensor 141 may include a transmission-typephotoelectric sensor, a direct reflective-type photoelectric sensor, amirror reflective-type photoelectric sensor, a high-frequencyoscillation-type proximity sensor, a capacitive-type proximity sensors,a magnetic-type proximity sensor, and an infrared proximity sensor. Ifthe touch screen is a capacitive type, the proximity sensor 141 may beconfigured to detect the proximity of an object by changes in anelectric field according to the proximity of the object havingconductivity. In this case, the touch screen (or a touch sensor) itselfmay be classified as a proximity sensor.

Moreover, for convenience of description, an action for recognizing theposition of an object on the touch screen as the object is close to thetouch screen without contacting the touch screen is called “proximitytouch” and an action that the object actually contacts the touch screenis called “contact touch”. A position that an object isproximity-touched on the touch screen is a position that the objectvertically corresponds to the touch screen when the object isproximity-touched. The proximity sensor 141 may detect a proximity touchand a proximity touch pattern (for example, a proximity touch distance,a proximity touch direction, a proximity touch speed, a proximity touchtime, a proximity touch position, and a proximity touch movement state).Moreover, the control unit 180 processes data (for information)corresponding to a proximity touch operation and a proximity touchpattern, detected through the proximity sensor 141, and furthermore, mayoutput visual information corresponding to the processed data on thetouch screen. Furthermore, depending on whether a touch for the samepoint on the touch screen is a proximity touch or a contact touch, thecontrol unit 180 may control the watch type device 100 to processdifferent operations or data (or information).

The touch sensor detects a touch (or a touch input) applied to the touchscreen (or the display unit 151) by using at least one of various touchmethods, for example, a resistive film method, a capacitive method, aninfrared method, an ultrasonic method, and a magnetic field method.

For example, the touch sensor may be configured to convert a pressureapplied to a specific portion of the touch screen or changes incapacitance occurring at a specific portion into electrical inputsignals. The touch sensor may be configured to detect a position andarea that a touch target applying a touch on the touch screen touchesthe touch sensor, a pressured when touched, and a capacitance whentouched. Here, the touch target, as an object applying a touch on thetouch sensor, may be a finger, a touch pen, a stylus pen, or a pointer,for example.

In such a manner, when there is a touch input on the touch sensor,signal(s) corresponding thereto are sent to a touch controller. Thetouch controller processes the signal(s) and then transmitscorresponding data to the control unit 180. Therefore, the control unit180 may recognize which area of the display unit 151 is touched. Herein,the touch controller may be an additional component separated from thecontrol unit 180 or may be the control unit 180 itself.

The heartbeat sensor 144 detects a light emitted from a light emittingunit (for example, a light emitting diode) from a light receiving unit(for example, a photo diode) and measures a heartbeat by using thedetected result.

A structure of the heartbeat sensor 144 and a user interfaceimplementation using the heartbeat sensor 144 are described in moredetail later.

Moreover, the control unit 180 may perform different controls or thesame control according to types of a touch target touching the touchscreen (or a touch key equipped separated from the touch screen).Whether to perform different controls or the same control according totypes of a touch target may be determined according to a currentoperation state of the watch type device 100 or an application programin execution.

Moreover, the above-mentioned touch sensor and proximity sensor areprovided separately or combined and may thus sense various types oftouches, for example, short (or tap) touch), long touch, multi touch,drag touch, flick touch, pinch-in touch, pinch-out touch, swipe touch,and hovering touch for the touch screen.

The display unit 151 may display (output) information processed in thewatch type device 100. For example, the display unit 151 may displayexecution screen information of an application program running on thewatch type device 100 or user interface (UI) and graphic user interface(GUI) information according to such execution screen information.

Additionally, the display unit 151 may be configured as athree-dimensional display unit displaying a three-dimensional image.

The sound output unit 152 may output audio data received from thewireless communication unit 110 or stored in the memory 170 in a callsignal reception or call mode, a recording mode, a voice recognitionmode, or a broadcast reception mode. The sound output unit 152 mayoutput a sound signal relating to a function (for example, a call signalreception sound and a message reception sound) performed by the mobileterminal 100. The sound output unit 152 may include a receiver, aspeaker, and a buzzer.

The haptic module 153 generates various haptic effects that a user canfeel. A representative example of a haptic effect that the haptic module153 generates is vibration. The intensity and pattern of vibrationgenerated by the haptic module 153 may be controlled by a user'sselection or a setting of a control unit. For example, the haptic module153 may synthesize and output different vibrations or output differentvibrations sequentially.

The optical output unit 154 outputs a signal for notifying eventoccurrence by using light of a light source of the watch type device100. An example of an event occurring in the watch type device 100includes message reception, call signal reception, missed calls, alarm,schedule notification, e-mail reception, and information receptionthrough an application.

The interface unit 160 may serve as a path to all external devicesconnected to the watch type device 100. The interface unit 160 mayreceive data from an external device, receive power and deliver it toeach component in the watch type device 100, or transmit data in thewatch type device 100 to an external device. For example, the interfaceunit 160 may include a wired/wireless headset port, an external chargerport, a wired/wireless data port, a memory card port, a port connectinga device equipped with an identification module, an audio I/O port, avideo I/O port, and an earphone port.

Moreover, the identification module, as a chip storing variousinformation for authenticating usage authority of the watch type device100, may include a user identity module (UIM), a subscriber identitymodule (SIM), and a universal subscriber identity module (USIM). Adevice equipped with an identification module (hereinafter referred toas an identification device) may be manufactured in a smart card form.Accordingly, the identification device may be connected to the terminal100 through the interface unit 160.

Moreover, as mentioned above, the control unit 180 may controloperations relating to an application program and overall operations ofthe watch type device 100 in general. For example, if a state of a watchtype device satisfies set conditions, the control unit 180 may executeor release a lock state limiting an output of a control command of auser for applications.

Additionally, the control unit 180 may perform a control or processingrelating to a voice call, data communication, and a video call mayperform pattern recognition processing for recognizing handwriting inputor drawing input on the touch screen as a text and an image,respectively. Furthermore, the control unit 180 may use at least one ora combination of the above components to perform a control in order toimplement various embodiments described below on the watch type device100.

The power supply unit 190 may receive external power or internal powerunder a control of the control unit 180 and may then supply powernecessary for an operation of each component. The power supply unit 190includes a battery. The battery is a rechargeable built-in battery andmay be detachably coupled to a terminal body in order for charging.

Additionally, the power supply unit 190 may include a connection portand the connection port may be configured as one example of theinterface unit 160 to which an external charger supplying power forcharging of the battery is electrically connected.

As another example, the power supply unit 190 may be configured tocharge a battery through a wireless method without using the connectionport. In this case, the power supply unit 190 may receive power from anexternal wireless power transmission device through at least one of aninductive coupling method based on a magnetic induction phenomenon, anda magnetic resonance coupling method based on an electromagneticresonance phenomenon.

FIG. 2A and FIG. 2B are conceptual diagrams when a watch type device isseen in different directions according to an embodiment of the presentinvention.

Referring to FIG. 2, the watch type terminal 100 includes a main body201 with a display unit 203 and a strap 202 connected to the main body201 to be worn on a wrist.

The main body 201 includes a case for forming the appearance.

The main body 201 is separated into a first case and a second case forpreparing an inner space to receive various electronic components andthey may be coupled to each other.

As another example, the main body 201 may have an integral form withoutbeing separated into first and second cases.

The watch type device 100 may be configured to allow wirelesscommunication and an antenna may be installed at the main body 201 inorder for the wireless communication. Moreover, the antenna may expandits performance by using a case. For example, a case including aconductive material may be configured to be electrically connected to anantenna in order to expand a ground area or a radiation area.

The display unit 203 may be disposed at the front of the main body 201to output information. A touch sensor may be provided at the displayunit 203 to be implemented as a touch screen.

The display unit 203 may be the display unit 151 shown in FIG. 1 but isnot limited thereto.

The main body 201 may include a sound output unit 152, a camera 121, anda microphone 122. When the display unit 203 is implemented as a touchscreen, it may function as a user input unit and accordingly, there isno additional key required at the main body 201.

The strap 202 is worn on a wrist to wrap it and may be formed of aflexible material in order for easy wearing. As such an example, thestrap 202 may be formed of leather, rubber, silicon, and syntheticresin. Additionally, the strap 202 may be configured to be detachablefrom the main body 201, so that it may be replaced with various forms ofstraps according to user preferences.

Moreover, the strap 202 may be used to expand the performance of anantenna.

For example, a ground expansion unit (not shown) electrically connectedto an antenna to expand a ground area may be built in a strap.

The strap 202 may include a fastener. The fastener may be implemented bya buckle, a snap-fit available hook structure, or Velcro (a brand name)and may include a stretchable interval or material. This drawingillustrates an example that the fastener is implemented in a buckleform.

As another example, the strap 202 may have an integrated form formed ofa flexible material without a fastener so that it may be worn on a wristthrough a user's hand.

Moreover, a heartbeat sensor 204 may be disposed at the rear of the mainbody 201.

The heartbeat sensor 204, as shown in FIG. 3, may include a lightemitting unit 205 for emitting light and a light receiving unit 207 forreceiving light.

The light emitting unit 205, for example, may include at least one greenlight emitting device but the present invention is not limited thereto.A light emitting device, for example, may include a semiconductor lightemitting device but the present invention is not limited thereto.

Light is emitted on/off periodically from the light emitting unit 205but the present invention is not limited thereto. For example, an ontime for which light is outputted may be about 40 μs.

As shown in FIG. 4, except for the light 213 of a red peak wavelength,the light 211 of a green peak wavelength has an excellent skinpenetration rate in comparison to the light of another peak wavelength.Herein, a red peak wavelength, for example, is about 656 nm and a greenpeak wavelength, for example, may be about 555 nm but the presentinvention is not limited thereto. Accordingly, a green light emittingdevice for emitting the light of a green peak wavelength may be used asthe light emitting unit 205 of the heartbeat sensor 204 shown in FIG. 3.As a skin penetration rate is excellent, the accuracy of heartbeatmeasurement becomes higher. However, the blood vessels used formeasuring a heartbeat are located deep inside the skin. Accordingly, inorder to accurately measure a heartbeat from blood vessels located deepinside a skin, the light 211 of a green peak wavelength having anexcellent skin penetration rate may be used.

As another example, the present invention is not limited thereto, and ared light emitting device for emitting the light of a red peakwavelength having a more excellent skin penetration rate than the lightof a green peak wavelength may be used as the light emitting unit 205.

As another example, the light emitting unit 205 may include both a redlight emitting device and a green light emitting device. In such a case,a red light emitting device or a green light emitting device may beselectively used according to the thickness of a skin. Whereas bloodvessels are located relatively deep inside a skin in a finger having athick skin, blood vessels are located relatively near a wrist having athin skin. Accordingly, when the heartbeat sensor 204 contacts a fingerhaving a relatively thick skin, that is, when the watch type device 100is gripped by a user's hand, a red light emitting device may operate andthe light of a red peak wavelength emitted from a red light emittingdevice may be used for detecting a touch interrupt signal. When theheartbeat sensor 204 contacts a wrist 209 having a relatively thin skin,that is, when the watch type device 100 is worn on a user's wrist 209, agreen light emitting device may operate and the light of a green peakwavelength emitted from a green light emitting device may be used fordetecting a touch interrupt signal.

Referring to FIG. 3 again, the light receiving unit 207 may include aplurality of photo diodes but the present invention is not limitedthereto. A photo diode may covert light into current and output it.

Accordingly, when the light, which penetrates the skin of the user'swrist 209 and is reflected after emitting from a red light emittingdevice, is incident to a photo diode, the photo diode may generate andprovide a current corresponding to the amount of the incident light.

As mentioned above, the light of a green peak wavelength may beoutputted periodically for an on time. Such an outputted light may bereflected on the inside of a skin of the user's wrist 209 and may beincident to a photo diode. A photo diode generates a currentcorresponding to the amount of a light outputted at each on time andreflected by the user's wrist 209.

A plurality of blood vessels exist in the user's wrist 209. Bloodvessels are a passage through which blood flows and the blood flows intoall the blood vessels of a body by the pumping of a heart. Since bloodflows in blood vessels by the pumping of a heart, the blood vessels arebouncing up and down with a waveform such as a wave.

In such a way, since blood vessels in the user's wrist 209 are bouncingup and down like a wave, the amount of a light reflected by the user'swrist 209 for each on time may vary. By the amount of a light that ischanged in this way, a current generated from a photo diode may alsovary.

Accordingly, a heartbeat may be measured through a current waveformgenerated from a photo diode.

In a typical heartbeat sensor, errors may occur during heartbeatmeasurement due to crosstalk phenomenon.

FIG. 5 is a sectional view illustrating a structure of a typicalheartbeat sensor.

Referring to FIG. 5, a typical heartbeat sensor 1 may have a gap Gbetween a cover 6 protecting a light emitting device 4 and a photo diode5 and a window 7. That is, the window 7 is spatially spaced from thecover 6.

The gap may be 0.1 mm to 1 mm typically.

In such a case, a part of light generated from a light emitting devicepenetrates the window 7 and progresses toward a user's wrist but anotherpart of light is reflected by the window 7 and incident to a photodiode.

The light progressing toward the user's wrist is reflected by bloodvessels in the user's wrist and is incident to the photo diode 5 throughthe window 7 again.

The photo diode 5 generates a current on the basis of a light (forexample, a second light 9) reflected by the window 7 and incidentwithout passing through the user's wrist in addition to a light (forexample, a first light 8) passing through the user's wrist. In such acase, since the second light is a light not passing through the user'swrist and is a parameter irrelevant to a heartbeat, the second light isreflected for the current generation, an accurate heartbeat measurementis impossible due to the generated current.

In such a case, in the typical heartbeat sensor 1, by the gap G betweenthe cover 6 and the window 7, a light generated from the light emittingdevice 4 does not pass through the user's wrist and is directly incidentto the photo diode 5, so that crosstalk phenomenon generating errors ofa heartbeat measurement may occur.

FIGS. 6 to 9 are views illustrating a heartbeat sensor for preventing acrosstalk phenomenon by disposing a member having a partition between alight receiving unit and a light emitting unit according to anembodiment of the present invention.

FIG. 6 is a view illustrating a heartbeat sensor according to a firstembodiment of the present invention.

Referring to FIG. 6, the heartbeat sensor 144 may include a substrate221, a main body 223, a light emitting unit 225, a light receiving unit227, a first layer 235, a second layer 237, a housing 220, and a cover253.

The light emitting unit 225 and the light receiving unit 227 may bemounted in the main body 223. The main body 223 may be formed of aninsulating material having an excellent heat dissipation property suchas epoxy or silicone. The light emitting unit 225 may be a red lightemitting device and the light receiving unit 227 may be a photo diode.

The main body 223 may be mounted on the substrate 221. Each of the lightemitting unit 225 and the light receiving unit 227 may be electricallyconnected to the substrate 221 through the main body 223. The substrate221 may include a first conductive pattern electrically connected to thelight emitting unit 225 and a second conductive pattern electricallyconnected to the light receiving unit 227.

The main body 223 may include first to third recesses 229, 231, and 233.For example, the light emitting unit 225 may be inserted and mounted inthe first recess 229. For example, the light receiving unit 227 may beinserted and mounted in the second recess 231. For example, a protrudingpart 249 protruding from the partition 247 of the first layer 235 towardthe bottom direction may be seated in the third recess 233.

The depth of the first recess 229 is identical to the thickness of thelight emitting unit 225; the depth of the second recess 231 is identicalto the thickness of the light receiving unit 227; and the depth of thethird recess 233 may be identical to the thickness of the protrudingpart 249. However, the present invention is not limited thereto.

Each of the first to third recesses 229, 231, and 233 may have a bottomsurface and an inner side surface having a predetermined depth from thetop surface of the main body 223.

The light emitting unit 225 may be inserted into the first recess 229and mounted on the bottom surface. The light receiving unit 227 may beinserted into the second recess 231 and mounted on the bottom surface.The protruding part 249 protruding from the partition 247 of the firstlayer 235 may be inserted into the third recess 233 and mounted on thebottom surface. The side surface of the light emitting unit 225 maycontact the inner side surface of the first recess 229; the side surfaceof the light receiving unit 227 may contact the inner side surface ofthe second recess 231; and the side surface of the protruding part 249of the first layer 235 may contact the inner side surface of the thirdrecess 233. However, the present invention is not limited thereto.

The light emitting unit 225 may be attached to the bottom surface andthe inner side surface of the first recess 229 by using an adhesivemember with an insulating property as a medium; the light receiving unit227 may be attached to the bottom surface and the inner side surface ofthe second recess 231 by using an adhesive member with an insulatingproperty as a medium; and the protruding part 249 of the first layer maybe attached to the bottom surface and the inner side surface of thethird recess 233 by using an adhesive member with an insulating propertyas a medium. However, the present invention is not limited thereto.

The first layer 235 may be disposed on the main body 223 where the lightemitting unit 225 and the light receiving unit 227 are mounted. Thefirst layer 235, as shown in FIGS. 7A and 7B, may include a catchingpart 243 formed along the frame, a partition 247 formed in the centerarea, and first and second openings 257 and 259 formed at both sides ofthe partition 247 on the basis of the partition 247. For example, thefirst opening 257 may correspond to the size of the top surface of thelight emitting unit 225 and the second opening 259 may correspond to thesize of the top surface of the light receiving unit 227. Each of thefirst and second openings 257 and 259 may have a circular, oval, square,or rectangular form, but the present invention is not limited thereto.

As another example, the partition 247 may be an additional member formedof a different material than the first layer 235.

The main body 223 may be covered by the first layer 235. The catchingpart 243 of the first layer 235 may be fixed at a catching ledge 245 ofthe housing 220. Accordingly, since the first layer 235 is fixed at thehousing 220, the first layer 235 does not move.

The bottom surface of the first layer 235 may contact the top surface ofthe main body 223 and the protruding part 249 protruding from thepartition 247 of the first layer 235 may contact the bottom surface ofthe third recess 233 of the main body 223. Therefore, since a pathbetween the light emitting unit 225 and the light receiving unit 227 areblocked completely by the partition 247 and the protruding part 249 ofthe first layer 235, a light from the light emitting unit 225 andreflected by the first window 239 without passing through a user's wristthrough the first window 239 is blocked by the partition 247 and theprotruding part 249 and thus is not incident to the light receiving unit227. Accordingly, it is possible to prevent heartbeat measurement errorsdue to a crosstalk phenomenon in which a light is generated from thelight emitting unit 225 and incident to the light receiving unit 227without passing through a user's wrist, so that the measurementperformance of the heartbeat sensor 144 may be enhanced and thus, itsreliability may be improved.

The width of the protruding part 249 may be identical to or narrowerthan the width of the third recess 233. The width of the protruding part249 may be narrower than the width of the partition 247 of the firstlayer 235. Accordingly, the protruding part 249 is inserted into thethird recess 233, and the remaining bottom surface excluding theprotruding part 249 in the bottom surface of the partition 247 contactsthe top surface of the central area of the main body 223. Therefore, bythe remaining bottom surface excluding the protruding part 249 in thebottom surface of the protruding part 249 and the partition 247, thefirst layer 235 may be strongly fixed to the main body 223.

The first layer is formed of a material having elasticity and blockinglight, for example, rubber, but the present invention is not limitedthereto.

The second layer 237 may be disposed on the first layer. The secondlayer 237 may include first and second windows 239 and 241. The firstand second windows 239 and 241 may be a transparent glass or plasticmaterial. Each of the first and second windows 239 and 241 may be acircular or oval form but the present invention is not limited thereto.

The first window 239 may correspond to the size of the top surface ofthe light emitting unit 225 through the first opening 257 of the firstlayer and the second window 241 may correspond to the size of the topsurface of the light receiving unit 227 through the second opening 259of the first layer 235.

The partition 251 may be disposed between the first and second windows239 and 241. The partition 251 may be a part of the second layer 237 butthe present invention is not limited thereto.

The width of the partition 251 of the second layer 237 may be formedsmaller than the width of the partition 247 of the first layer 235,thereby allowing the more light passing through the first opening 257 ofthe first layer 235 to progress toward a user's wrist and allowing themore light reflected by a user's wrist to be incident to the lightreceiving unit 227 through the second opening 259 of the first layer235.

The partition 251 may have an integrated form formed of the samematerial as the second layer 237 or may be an additional member formedof a different material than the second layer 237.

The second layer may be formed of a material for blocking light, forexample, a plastic material or rubber, but the present invention is notlimited thereto.

Each of the first and second windows 239 and 241 may be surrounded bythe second layer 237 and the partition 251.

When the size of the second layer 237 is greater than the size of thefirst layer 235 and the center point of the first layer 235 and thecenter point of the second layer 237 match, a peripheral area of thesecond layer 237 may extend from the end of the first layer 235 towardthe outside direction. In such a case, a support part 255 is disposedbetween a peripheral area of the second layer 237 and the housing 220 inorder to prevent the peripheral area of the second layer 237 fromsagging down. That is, the bottom surface of the support part 255 maycontact the housing 220 and the top surface of the support part 255 maycontact the peripheral area of the second layer 237. The support part255 may be attached to the top surface of the housing 220 and the bottomsurface of the second layer 237 by using an adhesive material as amedium.

The light generated from the light emitting unit 225 may be emitted tothe outside through the first opening 257 of the first layer 235 and thefirst window 239 of the second layer 237. The light reflected by auser's wrist may be incident to the light receiving unit 227 through thesecond window 241 of the second layer 237 and the second opening 259 ofthe first layer 235. In such a way, by the partition 247 and theprotruding part 249 of the first layer 235 and the partition 251 of thesecond layer 237, only the light generated from the light emitting unit225 and reflected by a user's wrist is incident to the light receivingunit 227 so that heartbeat measurement errors due to a crosstalkphenomenon may be prevented.

A cover 253 may be disposed on the second layer 237. The cover 253 maybe formed of a plastic material but the present invention is not limitedthereto. The cover 253 may be transparent or may not be transparent.

A peripheral area of the cover 253 may be fixed at or coupled to thehousing 220.

FIG. 8 is a view illustrating a heartbeat sensor according to a secondembodiment of the present invention.

Except that the partition 251 of the second layer 237 is removed and thefirst and second windows 239 and 241 are integrally formed in the firstembodiment, the second embodiment is similar to the first embodiment. Inthe second embodiment, the same reference numerals are assigned tocomponents having the same structure, form, and function as thecomponents of the first embodiment, and detailed description thereofwill be omitted.

As shown in FIG. 8, the second layer 237 may be disposed on the firstlayer. The second layer 237 may include a window 261. The window 261 maybe surrounded by the second layer 237. The window 261 may be a circularor oval form but the present invention is not limited thereto.

The size of the window 261 may be at least greater than the sum of thesize of the first opening 257 of the first layer 235, the size of thesecond opening 259, and the size of the partition 247. Accordingly, thelight generated from the light emitting unit 225 and passing through thefirst opening 257 of the first layer 235 may progress toward a user'swrist through the window 261 without loss. Moreover, the light reflectedby a user's wrist may be incident to the light receiving unit 227through the window 261 and the second opening 259 of the first layer235.

FIG. 9 is a view illustrating a heartbeat sensor according to a thirdembodiment of the present invention.

Except that the protruding part 249 of the first layer 235 is removedand the third recess 233 of the main body 223 where the protruding part249 of the first layer 235 is inserted is removed in the firstembodiment, the third embodiment is similar to the first embodiment. Inthe third embodiment, the same reference numerals are assigned tocomponents having the same structure, form, and function as thecomponents of the first embodiment, and detailed description thereofwill be omitted.

As shown in FIG. 9, the top surface of a main body 223 may include firstand second recesses 229 and 231. A light emitting unit 225 may beinserted and mounted into the first recess 229 and a light receivingunit 227 may be inserted and mounted into the second recess 231.

In the top surface of the center area of the main body 223 between thefirst recess 229 and the second recess 231, that is, the area where thethird recess 233 is formed in the first embodiment, the top surface of aperipheral area of the main body 223 may have the same position.

The bottom surface of each of the first recess 229 and/or the secondrecess 231 may have a lower position by a depth set from the center areaof the main body 223 and/or the top surface of a peripheral area of themain body 223.

The predetermined depth may be identical to the thickness of the lightemitting unit 225 and/or the light receiving unit 227 but the presentinvention is not limited thereto.

The first layer 235 may be disposed on the main body 223 where the lightemitting unit 225 and the light receiving unit 227 are mounted. Thefirst layer 235 may include first and second openings 257 and 259, apartition 247 formed between the first and second openings 257 and 259,and a catching part 243 extending from a peripheral area of the firstlayer 235 toward the bottom direction.

The thickness of the partition 247 may be identical to the thickness ofthe first layer 235 but the present invention is not limited thereto.

The bottom surface of the partition 247 of the first layer 235 contactsthe top surface of the center area of the main body 223, therebypreventing the light of the light receiving unit 225 from being incidentto the light receiving unit 227. For this, a pressure applied in thebottom direction occurs by the cover 253 and this pressure is applied tothe second layer 237. By the pressure applied to the second layer 237,the partition 247 of the first layer 235 is pressed in the bottomdirection so that the partition 247 of the first layer 235 may easilycontact the top surface of the center area of the main body 223.

As another example, the bottom surface of the first layer 235 may beattached to the top surface of the main body 223 by using an adhesivemember as a medium. By such an adhesive, the bottom surface of thepartition 247 of the first layer 235 strongly contacts the top surfaceof the center area of the main body 223, thereby stably maintaining thecontact state.

In consideration of this, like the first embodiment, the protruding part249 is provided on the first layer 235 so that the protruding part 249is inserted and mounted into the third recess 233 of the main body 223and also in a structure where the partition 251 is provided at thesecond layer 237 between the first and second windows 239 and 241, theremoval rate of the crosstalk phenomenon is 100% so that the crosstalkphenomenon may be completely removed.

As above, since the crosstalk phenomenon is completely removed by theheartbeat sensor 144 according to the first to third embodiments,heartbeat measurement errors due to the crosstalk phenomenon areprevented so that the measurement performance of the heartbeat sensor144 may be enhanced and thus, its reliability may be improved.

FIGS. 10 and 11 illustrate a heartbeat sensor for preventing a crosstalkphenomenon without using a first layer included in the heartbeat sensorsof the first to third embodiments.

FIG. 10 is a view illustrating a heartbeat sensor according to a fourthembodiment of the present invention.

Referring to FIG. 10, a main body 272 is mounted on a substrate 271 anda light emitting 273 and a light receiving unit 274 may be spaced apartfrom each other and mounted in the main body 272.

The main body 272 may have a center area and a peripheral area. Firstand second recesses 229 and 231 may be formed between the center area ofthe main body 272 and the peripheral area of the main body 272.

The top surface of the center area of the main body 272 and the topsurface of the peripheral area of the main body 272 may have the sameposition but the present invention is not limited thereto.

Each of the first and second recesses 229 and 231 may have a bottomsurface and an inner side surface having a predetermined depth from thetop surface of the main body 272.

The light emitting unit 273 may be inserted into the first recess 229and mounted on the bottom surface. The light receiving unit 274 may beinserted into the second recess 231 and mounted on the bottom surface.The side surface of the light emitting unit 273 may contact the innerside surface of the first recess 229 and the side surface of the lightreceiving unit 274 may contact the inner side surface of the secondrecess 231. However, the present invention is not limited thereto.

The light emitting unit 273 may be attached to the bottom surface andthe inner side surface of the first recess 229 by using an adhesivemember with an insulating property as a medium; and the light receivingunit 274 may be attached to the bottom surface and the inner sidesurface of the second recess 231 by using an adhesive member with aninsulating property as a medium. However, the present invention is notlimited thereto.

A cover 275 may be disposed on the main body 272. The cover 275 may beformed to surround the main body 272. In more detail, the cover 275 maycontact the top surface of the main body 272 and also may contact a sidesurface of the main body 272.

In the drawings, in consideration of a tolerance margin between thebottom surface of the cover 275 and the top surface of the substrate271, the bottom surface of the cover 275 and the substrate 271 may bespaced apart from each other but the bottom surface of the cover 275 maycontact the top surface of the top surface of the substrate 271.

The cover 275 may include first to third areas 262, 263, and 264. Thefirst area 262 of the cover 275 may contact the top surface of the mainbody 272. The second area 263 of the cover 275 may be bent from the endof the first area 262 of the cover 275 toward the bottom direction tocontact a side surface of the main body 272. The third area 264 of thecover 275 may extend from the end of the second area 263 of the cover275 toward the outside direction and may be formed.

As another example, the third area 264 may be removed and the cover 275including the first and second areas 262 and 263 may be provided.

As another example, the second and third areas 263 and 264 may be formedof a material for blocking light, for example, a plastic material.Accordingly, loss may be prevented when the light generated from thelight emitting unit 273 and incident to the cover 275 does not progresstoward a user's wrist or the light reflected by a user's wrist andincident to the cover 275 is not incident to the light receiving unit274 and progresses along the second and third areas 263 and 264 of thecover 275.

The cover 275 may be formed of a transparent material having anexcellent transmittance, for example, a glass or plastic material.Accordingly, the light generated from the light emitting unit 273 or thelight reflected by a user's wrist may freely pass through the cover 275.

A partition 276 may be provided to the cover 275. In more detail, thepartition 276 may be disposed at a position corresponding to the centerarea of the main body 272 between the light emitting unit 273 and thelight receiving unit 274. The partition 276 may be inserted and fixed tothe cover 275 through molding processing. The partition 276 may beformed of a material for blocking light, for example, a plasticmaterial.

For example, when the cover 275 is formed of glass and the partition 276is formed of a plastic material, by forming an opening at the cover 275and injecting a plastic material for forming the partition 276 into theopening and then curing it, the cover 275 with the partition 276 may bemanufactured. When seen from the top, the partition 276 may have arectangular form but the present invention is not limited thereto.

The partition 276 may be surrounded by the cover 275.

The bottom surface of the partition 276 may contact the top surface ofthe center area of the main body 272. Since the width of the partition276 is formed narrower than the width of the center area of the mainbody 272, the more light generated from the light emitting unit 274 isincident to a user's wrist through the cover 275 and the more lightreflected by a user's wrist may be incident to the light receiving unit274 through the cover 275.

Although not shown in the drawing, the cover 275 or the partition 276may contact the main body 272 by using an adhesive member as a mediumbut the present invention is not limited thereto.

According to the fourth embodiment, as the partition 276 is provided tothe cover 275, the cover 275 is disposed to directly contact the mainbody 272 so that like the first to third embodiments, a crosstalkphenomenon may be prevented without an additional first layer with thepartition 276.

FIG. 11 is a view illustrating a heartbeat sensor according to a fifthembodiment of the present invention.

Except for the housing 277, the fifth embodiment is identical to thefourth embodiment.

As shown in FIG. 11, the substrate 271, the main body 272, and the cover275 may be received and fixed by the housing 277. The housing 277 may beformed of a material having excellent elasticity and hardness, forexample, a plastic material, but the present invention is not limitedthereto.

The housing 277, for example, may have a “E” form. In more detail, thehousing 277 may include first to third areas 265, 267, and 269.

The first area 265 of the housing 277 may be disposed at one sides ofthe substrate 271 and the cover 275. Although it is shown in the drawingthat the inner side surface of the first area 265 is spaced apart fromthe side surface of the substrate 271, the inner side surface of thefirst area 265 may contact the side surface of the substrate 271.

The second area 267 of the housing 277 may extend from one end of thefirst area 265 in the horizontal direction and may be formed. The secondarea 267 of the housing 277 may contact the bottom surface of thesubstrate 271. In more detail, the second area 267 of the housing 277may be attached to the bottom surface of the substrate 271 by using anadhesive member as a medium.

The third area 269 of the housing 277 may extend from the other end ofthe first area 265 in the horizontal direction and may be formed. Thethird area 269 of the housing 277 may have an opening 270. The size ofthe opening 270 is formed to be identical to the size of the first area262 of the cover 275 so that the first area 262 of the cover 275 may beinserted into the opening 270 of the housing 277. The third area 269 ofthe housing 277 may be attached to the second area 263 and the thirdarea 264 of the cover 275 by using an adhesive member as a medium.

According to the fifth embodiment, since the housing 277 fixes thesubstrate 271 disposed below the main body 272 where the light emittingunit 273 and the light receiving unit 274 are mounted and the cover 275disposed over the main body 272, this may enhance the product robustnessof a heartbeat sensor.

FIGS. 12 and 13 illustrate a heartbeat sensor where light emitting unitsare disposed at both sides of a light receiving unit.

FIG. 12 is a view illustrating a heartbeat sensor according to a sixthembodiment of the present invention.

Referring to FIG. 12, a heartbeat sensor 144 according to the sixthembodiment may include one or more light emitting units 294 and 295 anda light receiving unit 296.

For example, the first light emitting unit 294 may be disposed at oneside of the light receiving unit 296 and the second light emitting unit295 may be disposed at the other side of the light receiving unit 296.

The first light emitting unit 294 may include at least one lightemitting device. For example, the first light emitting unit 294 mayinclude a green light emitting device.

The second light emitting unit 295 may include a plurality of lightemitting devices. For example, the second light emitting unit 295, forexample, an infrared light emitting device, a red light emitting device,and a green light emitting element. A red light emitting device may bedisposed between an infrared light emitting device and a green lightemitting device but the present invention is not limited thereto.

Since the red light of a red light emitting device penetrates a skinfurther deeply in comparison to the green light of a green lightemitting device, for example, the red light emitting device may be usedto measure the heartbeat of a user's wrist of a relatively thin skin andthe green light emitting device may be used to measure the heartbeat ofa user's finger of a relatively thick skin. The infrared light emittingdevice may be used to detect whether an object is close.

The first and second light emitting units 294 and 295 and the lightreceiving unit 296 may be mounted on the substrate 280. The first andsecond light emitting units 294 and 295 and the light receiving unit 296may be electrically connected to the substrate 280. Accordingly, thefirst and second light emitting units 294 and 295 operate by power sothat light may be generated from the first and second light emittingunits 294 and 295.

A plurality of partitions 282, 283, 284, and 285 may be disposed on thesubstrate 280. In more detail, the first and fourth partitions 282 and285 may be disposed on the both sides of the substrate 280; the secondpartition 283 may be disposed between the first light emitting unit 294and the light receiving unit 296; and the third partition 284 may bedisposed between the light receiving unit 296 and the second lightemitting unit 295.

Each of the first light emitting unit 294 or the second light emittingunit 295 may have a self-luminous radiation angle (hereinafter referredto as a first light emission radiation angle). Each of the first lightemitting unit 294 or the second light emitting unit 295 may have aself-luminous radiation angle, for example, a range of about 90° toabout 150°.

However, the first light emission radiation angle of each of the firstlight emitting unit 294 or the second light emitting unit 295 may changeinto a second light emission radiation angle by the height of each ofthe partitions 282, 283, 284, and 285.

The second light emission radiation angle may be smaller than the firstlight emission radiation angle by the height of each of the partitions282, 283, 284, and 285. That is, even when the first light emissionradiation angle is larger than the second light emission radiationangle, the first light emission radiation angle becomes smaller as thesecond light emission radiation angle by the height of each of thepartitions 282, 283, 284, and 285.

For example, the second light emission radiation angle may have a rangeof about 90° to about 120°. In more detail, the second light emissionradiation angle may have about 90°.

As the height of each of the partitions 282, 283, 284, and 285 ishigher, the second light emission radiation angle may become smaller,and as the height of each of the partitions 282, 283, 284, and 285 islower, the second light emission radiation angle may become larger.

In the same manner, the light receiving unit 296 may have a self lightreception radiation angle (hereinafter referred to as a first lightreception radiation angle). The self light reception radiation angle ofthe light receiving unit 296, for example, may have a range of about 90°to about 150°.

However, the first light reception radiation angle of the lightreceiving unit 296 may change into a second light reception radiationangle by the height of the second and/or third partition 283 and/or 284.

The second light reception radiation angle may become smaller than thefirst light reception radiation angle by the height of the second and/orthird partition 283 and/or 284. That is, even if the first lightreception radiation angle is larger than the second light receptionradiation angle, the first light reception radiation angle becomessmaller as the second light reception radiation angle by the height ofthe second and/or third partition 283 and/or 284.

For example, the second light reception radiation angle may have a rangeof about 90° to about 120°. In more detail, the second light receptionradiation angle may have about 120°.

As the height of the second and/or third partition 283 and/or 284becomes higher, the second light reception radiation angle becomessmaller, and as the height of the second and/or third partition 283and/or 284 becomes lower, the second light reception radiation anglebecomes larger.

According to the sizes of the first light emitting unit 294, the secondlight emitting unit 295, and the light receiving unit 296, intervalsbetween the partitions 282, 283, 284, and 285 may vary. For example, aninterval between the second and third partition 283 and 284 may begreater than an interval between the first and second partitions 282 and283 or an interval between the third and fourth partitions 284 and 285.

The first to fourth partitions 282, 283, 284, and 285 may be integrallyformed with the substrate 280 or may be formed separately from thesubstrate 280.

The height of the second and/or third partition 283 and/or 284 may belower than the height of the first and/or fourth partition 282 and/or285. That is, the thickness of the second and/or third partition 283and/or 284 may be thinner than the thickness of the first and/or fourthpartition 282 and/or 285.

A layer 286 may be disposed on the first to fourth partitions 282, 283,284, and 285.

The layer 286 is formed of a material having elasticity and blockinglight, for example, rubber, but the present invention is not limitedthereto.

The layer 286 may cover at least a part of the top surfaces of the firstto fourth partitions 282, 283, 284, and 285 and the side surfaces of thefirst and fourth partitions 282 and 285. In more detail, the first areaof the layer 286 may cover the second partition 283 and the second areaof the layer 286 may cover the third partition 284. Herein, the firstarea of the layer 286 is referred to as the first partition 287 and thesecond area of the layer 286 is referred to as the second partition 288.

As another example, the first partition 287 and the second partition 288may be formed as an additional member different from the layer 286. Insuch a case, the first and second partitions 287 and 288 may be formedof a material for blocking light, for example, a rubber or plasticmaterial.

Each of the first and second partitions 287 and 288 may include aprotruding area protruding from the bottom surface of the layer 286toward the bottom direction. The bottom surface of the protruding areamay contact each of the second and third partitions 283 and 284. Asmentioned above, since the height of the second and/or third partition283 and/or 284 is lower than the height of the first and/or fourthpartition 282 and/or 285, a protruding area protruding from the bottomsurface of the layer 286 toward the bottom direction by the loweredheight may be formed.

As another example, the heights of all the first to fourth partitions282 to 285 may be identical to each other. In such a case, the thicknessof the first and second partitions 287 and 288 may be identical to thethickness of the layer 286.

A cover 289 may be disposed on the layer 286. The cover 289, as atransparent material, may be a plastic material or glass.

The cover 289 may include the first and second partitions 291 and 292.The first partition 291 of the cover 289 is disposed on the firstpartition 291 of the layer 286 and the second partition 292 of the cover289 may be disposed on the second partition 292 of the layer 286.

The first and second partitions 291 and 292 may be inserted into thecover 289 and formed through molding processing.

The width of each of the first and second partitions 291 and 292 of thecover 289 may be identical to the width of each of the first and secondpartitions 287 and 288 of the layer 286 but the present invention is notlimited thereto.

The first and second partitions 291 and 292 may be formed of a lightblocking member for blocking light.

The first and second partitions 291 and 292 of the cover 289 and thefirst and second partitions 287 and 288 of the layer 286 may include thesame material but the present invention is not limited thereto.

The bottom surfaces of the first and second partitions 291 and 292 ofthe cover 289 may respectively contact the top surfaces of the first andsecond partitions 287 and 288 of the layer 286. In more detail, thebottom surfaces of the first and second partitions 291 and 292 of thecover 289 may be respectively attached to the top surfaces of the firstand second partitions 287 and 288 of the layer 286 by using an adhesivemember as a medium.

FIG. 13 is a view illustrating a heartbeat sensor according to a seventhembodiment of the present invention.

A cover 275 and a housing 277 shown in FIG. 13 may be identical to thecover 275 and the housing 277 shown in FIG. 11.

As shown in FIG. 13, the cover 275 may contact the top surfaces of thefirst to fourth partitions 282 to 285 and the side surfaces of the firstand fourth partitions 282 and 285. The first to fourth partitions 282,283, 284 and 285 are fixed by the cover 275 and a crosstalk phenomenonmay be prevented by the first and second partitions 298 and 299 of thecover 275.

The cover 275 may include the first to third areas 262, 263, and 264.The second area 263 of the cover 275 may extend from both ends of thefirst area 262 of the cover 275 toward the bottom direction and may beformed, and the third area 264 of the cover 275 may extend from the endof the second area 263 of the cover 275 toward the outside direction andmay be formed.

In more detail, the first and second partitions 298 and 299 mayrespectively contact the second and third partitions 283 and 284; thefirst area 262 of the cover 275 may contact the top surfaces of thefirst and fourth partitions 282 and 285; and the second area 263 of thecover 275 may contact the side surfaces of the first and fourthpartitions 282 and 285.

The cover 275 and the substrate 280 may be fixed by the housing 277. Thehousing 277 may be attached to the substrate 280 and the cover 275 byusing an adhesive member as a medium. The housing 277 may be attached tothe bottom surface of the substrate 280 and may be attached to thesecond area 263 and the third area 264 of the cover 275.

The housing 277 may include first to third areas 265, 267, and 269. Thesecond area 267 of the housing 277 may extend from one end of the firstarea 265 of the housing 277 toward the horizontal direction and may beformed, and the third area 269 of the housing 277 may extend from theother end of the first area 265 of the housing 277 toward the horizontaldirection and may be formed.

The second area 267 of the housing 277 may contact the bottom surface ofthe substrate 280. In more detail, the second area 267 of the housing277 may contact the bottom surface of the substrate 280 by using anadhesive member as a medium. Furthermore, the third area 269 of thehousing 277 may be attached to the second area 263 and the third area264 of the cover 275 by using an adhesive member as a medium.

The third area 269 of the housing 277 may have an opening 270. The sizeof the opening 270 is formed to be identical to the size of the firstarea 262 of the cover 275 so that the first area 262 of the cover 275may be inserted into the opening 270 of the housing 277.

According to the sixth and seventh embodiments, in a heartbeat sensorwhere the first and second light emitting units 294 and 295 are disposedat both sides of the light receiving unit 296, a crosstalk phenomenon isprevented by using the partitions 283, 284, 287, 288, 291, and 292 andthus product reliability may be improved.

Hereinafter, embodiments relating to control method that is to beimplemented for the watch type device 100 configured in such a mannerare described with reference to the accompanying drawings. It isapparent to those skilled in the art that the present invention may bespecified in a different specific form without departing from the scopeand essential features of the present invention.

The watch type device 100 may detect a wearing state of the watch typedevice 100 by a user and may execute a corresponding function accordingto a detection result, that is, not-wearing, wrist wearing, and handgripping. Herein, not-wearing is referred to as a first mode; wristwearing is referred to as a second mode; and hand gripping is referredto as a third mode.

For example, in the first mode and/or the third mode, a black screen oran ambient screen may be displayed.

For example, a standby screen may be displayed in the second mode.

In terms of power consumption, a black screen is displayed in the sleepmode; an ambient screen is displayed in the ambient mode; and a standbyscreen may be displayed in the normal mode.

In the sleep mode, as a screen off state, the power of the power supplyunit 190 is not supplied to the screen so that a black screen may bedisplayed. In this case, since power is supplied a touch sensor providedat the display unit 151, touch recognition is possible.

In the standby mode, as a screen on state, the power of the power supplyunit 190 is supplied to the screen so that a standby screen may bedisplayed.

Although the ambient mode is the screen on state, power lower than thepower supplied to the standby screen is supplied to the screen so thatthe ambient screen having a lower brightness than the standby screen maybe displayed.

In the ambient mode, a function not interfering with informationdelivery to a user while reducing power consumption, for example,providing a simple notification information, may be performed. Such afunction may include missed call notification, schedule notification,calendar notification, remaining battery capacity notification, andweather notification but the present invention is not limited thereto.

In the normal mode, a function using power normally, for example, datatransmission/reception, telephone calls, and video streams in additionto a watch function, may be performed.

For example, the standby screen may be displayed in the normal mode. Thestandby screen may include a digital watch screen, an analog watchscreen, and a home screen including a plurality of icons. In moredetail, in the normal mode, since a standby screen such as a digitalwatch screen, an analog watch screen, or a home screen is displayed bythe power of the power supply unit 190, information in the high level ofbrightness may be displayed on the standby screen.

The wearing state of the watch type device 100 may be detected by theheartbeat sensor 144 and the acceleration sensor 143 provided at thewatch type device 100.

The acceleration sensor 143 may detect a motion of the watch type device100. The acceleration sensor 143 may generate an absolute motiondetection (AMD) signal (for example, a first sensing signal) indicatinga relatively small motion and a relative motion detection (RMD) signal(for example, a second sensing signal) indicating a relatively largemotion.

Each of the AMD signal and the RMD signal may have “0” or “1”. “0”, asan inactive signal, may indicate no motion. “1” may be an active signal.When the AMD signal is “1”, it indicates that a small motion is detectedand when the RMD signal is “1”, it indicates that there is a largemotion.

For example, when the watch type device 100 is laid on a floor or adesk, since the watch type device 100 does not move, the accelerationsensor 143 of the watch type device 100 may output the AMD signal of “0”and the RMD signal of “0”.

For example, when the watch type device 100 is worn by a user, since thewatch type device 100 is shaking frequently, the acceleration sensor 143of the watch type device 100 may output the AMD signal of “1” but mayoutput the RMD signal of “0” or “1” according to the degree of shakingof the watch type device 100. That is, when the watch type device 100has a relatively small shaking, the RMD signal of “0” may be outputtedand when the watch type device 100 has a relatively large shaking, theRMD signal of “1” may be outputted. Since the AMD signal of “1”indicates that the watch type device 100 has a relatively small shaking,at this point, the RMD signal may be “0” or “1”. On the other hand, whenthe RMD signal is “1”, since this indicates that the watch type device100 has a relatively large shaking, at this point, the AMD signal may bealways “1”.

TABLE 1 AMD signal RMD signal State 0 0 Not-wearing 1 0 Wearing 1 1Wearing

As shown in Table 1, a distinction between not-wearing and wearing ispossible by the acceleration sensor 143 but it is difficult todistinguish wrist wearing from hand gripping during wearing.

Wrist wearing and hand gripping may be distinguished by the heartbeatsensor 144.

The heartbeat sensor 144 may generate a touch interrupt signal on thebasis of the amount of light reflected by a user. A touch interruptsignal generated from the heartbeat sensor 144 may have a signalvariation v and a bias as shown in FIG. 14. Herein, the bias may be thesize of a touch interrupt signal.

For example, a first touch interrupt signal PPG1 has almost no signalchange and a less bias. On the other hand, a second touch interruptsignal PPG2 has a relatively large signal variation v and a large bias.

The first touch interrupt signal PPG1 is a signal detected by a user'swrist and the second touch interrupt signal PPG2 is a signal detected bya user's finger.

As shown in FIG. 14, the size of a signal variation of the second touchinterrupt signal PPG2 detected from a finger may be 15 to 20 timesgreater than the size of a signal variation of the first touch interruptsignal PPG1 detected from a wrist. Furthermore, a bias of the secondtouch interrupt signal PPG2 detected from a finger is significantlygreater than a bias of the first touch interrupt signal PPG1 detectedfrom a wrist.

For example, when the watch type device 100 is gripped by a finger, thesecond touch interrupt signal PPG2 may be detected from a user's finger.

For example, when the watch type device 100 is worn on a wrist, thefirst touch interrupt signal PPG1 may be detected from the user's wrist.

Accordingly, where the watch type device 100 is worn may be obtained onthe basis of a touch interrupt signal detected from the heartbeat sensor144.

As waveform information (for example, signal variation and bias) of thefirst touch interrupt signal PPG1 and waveform information of the secondtouch interrupt signal PPG2, shown in FIG. 14, are stored in the watchtype device 100, a wearing state of the watch type device 100 may beobtained in detail on the basis of a touch interrupt signal detectedfrom the heartbeat sensor 144.

Moreover, a heartbeat signal may be generated by the heartbeat sensor144 and user authentication may be performed by using the heartbeatsignal.

The principle of generating a touch interrupt signal or a heartbeatsignal from the heartbeat sensor 144 is the same. However, a touchinterrupt signal or a heartbeat signal may be determined according to inwhich situation the heartbeat sensor 144 is used.

For example, in a wearing detection situation, a signal generated fromthe heartbeat sensor 144 may be used as a touch interrupt signal. Asmentioned above, a touch interrupt signal may vary depending on whetherthe watch type device 100 is worn on a wrist or gripped by a hand.

For example, in user authentication situation, a signal generated fromthe heartbeat sensor 144 may be used as a heartbeat signal. In the caseof the same user, a heartbeat signal generated from the wrist of theuser (that is, the owner) may the same each time it is measured. On theother hand, when the watch type device 100 is worn on another user'swrist, a heartbeat signal different from the heartbeat signal of theuser (that is, the owner) may be generated. Accordingly, userauthentication may be successfully performed by using differentheartbeat signals for each user only if the watch type device 100 isworn on the wrist of a user (that is, an owner), and then subsequentoperations may be performed. Such a user authentication process using aheartbeat signal generated from the heartbeat sensor 144 is shown inFIGS. 27 and 37 and this will be described later.

FIG. 15 is a flowchart illustrating a method of detecting whether awatch type device is worn according to an embodiment of the presentinvention.

The watch type device 100 detects whether a user does not wear it (forexample, a first mode) in operation S301.

In more detail, the acceleration sensor 143 of the watch type device 100detects a shaking of the watch type device 100. The control unit 180 ofthe watch type device 100 may check whether the watch type device 100 isworn on the basis of a detection result of the acceleration sensor 143of the watch type device 100.

When the AMD signal of “0” and the RMD signal of “0” are inputted fromthe acceleration sensor 143 of the watch type device 100 on the basis ofa detection result, the control unit 180 of the watch type device 100may determine that a user does not wear the watch type device 100.

When the RMD signal of “1” is inputted from the acceleration sensor 143of the watch type device 100 on the basis of a detection result, thecontrol unit 180 of the watch type device 100 may determine that a userwears the watch type device 100. Whether the AMD signal is “0” or “1”does not affect wearing state detection. That is, a value of the AMDsignal is irrelevant to wearing state detection.

Although not shown in the drawings, when the RMD signal of “1” isinputted from the acceleration sensor 143 of the watch type device 100and the RMD signal of “1” is maintained for more than 4 sec, the controlunit 180 of the watch type device 100 may determine that the watch typedevice 100 is worn by a user, but the present invention is not limitedthereto.

Although not shown in the drawing, it is determined whether an object isclose by using an infrared light emitting device of the heartbeat sensor144 shown in FIGS. 12 and 13. A not-wearing state or a wearing state maybe detected by using an infrared light emitting device of the heartbeatsensor 144.

Although not shown in the drawings, a wearing state or a not-wearingstate may be detected more accurately by using infrared light emittingdevices of the acceleration sensor 143 and the heartbeat sensor 144.

As mentioned above, the acceleration sensor 143 of the watch type device100 only distinguishes wrist wearing from not-wearing and cannotdistinguish wrist wearing from hand gripping during wearing.

Referring to FIG. 15, when it is determined that the watch type device100 is not worn by a user, the control unit 180 of the watch type device100 executes a function of the watch type device 100 during not-wearing,that is, a function in the first mode, in operation S303.

For example, a black screen (see FIG. 16A) may be displayed on thedisplay unit 151 of the watch type device 100 during not-wearing. Theblack screen, as mentioned above, as a screen off state, may mean thatpower is not supplied to a screen. Separately, power is supplied to atouch sensor provided at the display unit 151 so that touch recognitionis possible. In such a way, power is not supplied to a screen duringnot-wearing so that power consumption may be reduced.

For example, an ambient screen may be displayed on the display unit 151of the watch type device 100 during not-wearing.

Moreover, a black screen or an ambient screen may be displayed duringnot-wearing and not all components are activated. That is, a minimum ofcomponents, for example, only the control unit 180, the sensing unit140, the input unit 120, the wireless communication unit 110, and theoutput unit 150, may be activated.

If it is determined that the watch type device 100 is worn by a user,the control unit 180 of the watch type device 100 supplies (oractivates) power to the heartbeat sensor 144 to operate the lightemitting unit 225 and the light receiving unit 227.

The heartbeat sensor 144 of the watch type device 100 may generate atouch interrupt signal on the basis of the amount of light reflectedfrom a user. The control unit 180 of the watch type device 100 may checka specific wearing state on the basis of a detection result of theheartbeat sensor 144, for example, wrist wearing and hand gripping.

As shown in FIG. 14, a signal variation and a bias of a touch interruptsignal detected from the heartbeat sensor 144 correspond to a signalvariation and a bias of a first touch interrupt signal PPG1, the controlunit 180 of the watch type device 100 may determine that the watch typedevice 100 is worn on a user's wrist.

Furthermore, a signal variation and a bias of a touch interrupt signaldetected from the heartbeat sensor 144 correspond to a signal variationand a bias of a second touch interrupt signal PPG2, the control unit 180of the watch type device 100 may determine that the watch type device100 is gripped by a user's hand.

Referring to FIG. 15, the control unit 180 of the watch type device 100detects whether a user wears the watch type device 100 by a wrist (forexample, a second mode) in operation S305.

In more detail, when the AMD signal of “1” is outputted from theacceleration sensor 143 of the watch type device 100 and when a touchinterrupt signal generated from the heartbeat sensor 144 of the watchtype device 100 corresponds to a first touch interrupt signal PPG1 shownin FIG. 14, the control unit 180 of the watch type device 100 maydetermine that the watch type device 100 is worn on a user's wrist.

When it is determined that the watch type device 100 is worn by a user'swrist, the control unit 180 of the watch type device 100 executes afunction of the watch type device 100 during wrist wearing, that is, afunction in the second mode, in operation S307.

For example, a predetermined screen may be displayed on the display unit151 of the watch type device 100 during wrist wearing. The predeterminedscreen, for example, may include an analog watch screen (see FIG. 16B),a digital watch screen (see FIG. 16C), a home screen including aplurality of icons, and simple notification information. Alternatively,a predetermined screen may be a black screen or an ambient screen.

The simple notification information may include numbers, characters, andimages, or icons representing text message notification, SNSnotification, e-mail notification, and so on. The simple notificationinformation does not include detailed information of each notification,for example, when, from who, and what content. In order to view detailedinformation of each notification, after simple notification informationis displayed, an additional event (or gesture) is performed or anauthentication process is performed.

In the analog watch screen, it may be set that only hands and dials arerepresented with a white grayscale and the background is representedwith a black grayscale to turn off its power. In the digital watchscreen, it may be set that only time related numbers are representedwith a white grayscale and the background is represented with a blackgrayscale to turn off its power. In such a way, since the backgroundthat occupies most of an analog watch screen or a digital watch screendoes not require power supply, power consumption may be reduced.

Accordingly, even when an analog watch screen or a digital watch screenis displayed, since there is almost no power consumption, as long as auser wears the watch type device 100 by the wrist, the analog watchscreen or the digital watch screen may be always displayed withoutturning off the screen. This is called an “always-on function”.

As another example, a lock screen is displayed before a predeterminedscreen is displayed on the display unit 151 during wrist wearing andwhen lock release is performed on the lock screen, the predeterminedscreen may be displayed on the display unit 151.

As another example, when a predetermined screen displayed on the displayunit 151 is a home screen including a plurality of icons during wristwearing, a lock screen may be displayed before the predetermined screenis displayed on the display unit 151 and the home screen may bedisplayed when lock release is performed on the lock screen.

As another example, when a predetermined screen is a digital watchscreen or an analog watch screen during wrist wearing, a lock screen maynot be displayed before the predetermined screen is displayed. That is,since a digital watch screen or an analog watch screen does not requiresecurity, a lock release process is not required.

Referring to FIG. 15, the control unit 180 of the watch type device 100detects whether a user grips the watch type device 100 by a hand (forexample, a third mode) in operation S309.

In more detail, when the RMD signal of “1” is outputted from theacceleration sensor 143 of the watch type device 100 and when a touchinterrupt signal of the watch type device 100 corresponds to a secondtouch interrupt signal PPG2 shown in FIG. 14, the control unit 180 ofthe watch type device 100 may determine that the watch type device 100is gripped by a user's hand.

When it is determined that the watch type device 100 is gripped by auser's hand, the control unit 180 of the watch type device 100 executesa function of the watch type device 100 during hand gripping, that is, afunction in the third mode, in operation S311.

For example, while the watch type device 100 is gripped by a hand, ablack screen or an ambient screen may be displayed on the display unit151 of the watch type device 100. In the black screen, as a screen offstate, power is not supplied to a screen. In the ambient screen, as ascreen on state, power lower than the power of the power supply unit 190is supplied to the display unit 151, so that power consumption may bereduced.

In such a way, when the watch type device 100 is gripped by a hand, ablack screen in a screen off state is displayed or an ambient screen inan on state is displayed while power lower than the power of the powersupply unit 190 is supplied so that power consumption may be reduced.

As another example, when the watch type device 100 is gripped by a hand,an ambient screen including simple notification information may bedisplayed on the display unit 151 of the watch type device 100.Accordingly, a user may check simple notification information bygripping the watch type device 100 without wearing it by a wrist.

The simple notification information may include numbers, characters,images, or icons representing text message notification, SNSnotification, e-mail notification, and so on. The simple notificationinformation does not include detailed information of each notification,for example, when, who, and what content. In order to view detailedinformation of each notification, after simple notification informationis displayed, an additional event (or gesture) is performed or anauthentication process is performed.

In brief, the watch type device 100 may determine a first mode (forexample, not-wearing), a second mode (for example, wrist wearing), and athird mode (for example, hand gripping) by using the acceleration sensor143 and the heartbeat sensor 144 and may execute a function in thedetermined mode.

For example, a black screen may be displayed on the display unit 151 inthe first mode.

For example, a black screen or an ambient screen may be displayed on thedisplay unit 151 in the third mode.

For example, a standby screen instead of a black screen or an ambientscreen may be displayed on the display unit 151 in the second mode. Thestandby screen may include an analog watch screen, a digital watchscreen, and a home screen including a plurality of icons.

Hereinafter, wearing detection shown in FIG. 15 is described in detail.

FIG. 17 is a flowchart illustrating a method of detecting a not-wearingstate of the watch type device of FIG. 15 according to an embodiment ofthe present invention. FIG. 17 is a view embodying operations S301 andS303 of FIG. 15.

Referring to FIG. 17, the control unit 180 of the watch type device 100checks whether the RMD signal outputted from the acceleration sensor 143is “0” and the AMD signal is “0” in operation S315. When the RMD signalis “0” and the AMD signal is “0”, the control unit 180 of the watch typedevice 100 determines it as not-wearing (that is, the first mode) inoperation S317 and executes a function in the first mode in operationS319.

In determining a not-wearing state, the heartbeat sensor 144 may not beused. That is, a not-wearing state may be determined by using only theacceleration sensor 143 without using the heartbeat sensor 144.

For example, a black screen shown in FIG. 16A may be displayed on thedisplay unit 151 in the first mode.

FIG. 18 is a flowchart illustrating a method of detecting a wearingstate of the watch type device of FIG. 15 according to an embodiment ofthe present invention.

FIG. 18 is a view embodying operations S305 to S311 of FIG. 15.

Referring to FIG. 18, the control unit 180 of the watch type device 100checks whether the RMD signal outputted from the acceleration sensor 143is “1” and the AMD signal is “1”.

As mentioned above, when the RMD signal is “1”, since the AMD signal isalways “1”, the control unit 180 of the watch type device 100 may not benecessary to check whether the AMD signal is “0” or “1” and may onlycheck whether the RMD signal is “1”.

Then, the control unit 180 of the watch type device 100 checks whetherthe RMD signal of “1” and the AMD signal of “1” are maintained for morethan 4 sec in operation S321. Herein, 4 sec is one exemplary thresholdvalue for convenience of description and such a threshold value may varyaccording to a manufacturer or a user.

When the RMD signal of “1” and the AMD signal of “1” are maintained formore than 4 sec, the control unit 180 of the watch type device 100determines it as a wearing state (for example, a second or third mode)in operation S323.

Herein, the second mode may mean a state where the watch type device 100is worn on a user's wrist and the third mode may mean a state where thewatch type device 100 is gripped by a user's hand.

As mentioned above, only a wearing state and a not-wearing state may bedetermined by the RMD signal and the AMD signal outputted from theacceleration sensor 143.

Accordingly, in order to distinguish wrist wearing from hand grippingduring wearing, the heartbeat sensor 114 may be used.

That is, the control unit 180 of the watch type device 100 performs acontrol on the heartbeat sensor 144 in order to generate a touchinterrupt signal from the heartbeat sensor 144 in operation S325.

The heartbeat sensor 144 may prevent a crosstalk phenomenon as shown inFIGS. 6 to 13 in order to improve reliability.

The control unit 180 of the watch type device 100 calculates a signalvariation and a bias from the generated touch interrupt signal inoperation S327.

The signal variation may represent a waveform variable width of a touchinterrupt signal and the bias may represent an average value of touchinterrupt signals but the present invention is not limited thereto.

The control unit 180 of the watch type device 100 checks whether thecalculated signal variation exceeds a predetermined setting range andthe calculated bias is greater than a predetermined setting value inoperation S329.

Herein, the predetermined setting range and the setting value mayrespectively correspond to the signal variation and the bias of thefirst touch interrupt signal PPG1 shown in FIG. 14.

When the calculated signal variation exceeds the predetermined settingrange and the calculated bias is greater than the predetermined settingvalue, that is, they correspond to the second touch interrupt signalPPG2 shown in FIG. 14, the control unit 180 of the watch type device 100determines it as hand gripping (that is, the third mode) in operationS335 and executes a function in the third mode in operation S337.

For example, the black screen shown in FIG. 16A or an ambient screen maybe displayed on the display unit 151 in the third mode. The ambientscreen may have a lower brightness than the standby screen in order toreduce power consumption.

When the calculated signal variation is within the predetermined settingrange and the calculated bias is the predetermined setting value, thecontrol unit 180 of the watch type device 100 determines it as wristwearing (that is, the second mode) in operation S331 and executes afunction in the second mode in operation S333.

For example, in the second mode, the analog watch screen (see FIG. 16B),the digital watch screen (see FIG. 16C), or a standby screen such as ahome screen may be displayed on the display unit 151.

As another example, a signal variation and a bias of the first touchinterrupt signal PPG1 shown in FIG. 14 are stored as first settinginformation and a signal variation and a bias of the second touchinterrupt signal PPG2 shown in FIG. 14 are stored as second settinginformation. In such a case, it is checked that to which one of thefirst setting information and the second setting information the signalvariation and the bias calculated in operation S327 correspond. If theycorrespond to the first setting information, it is determined as wristwearing (for example, the second mode) and if they correspond to thesecond setting information, it is determined as hand gripping (forexample, the third mode).

Moreover, a green light emitting device used as the light emitting unit225 may be provided to the heartbeat sensor 144. As the heartbeat sensor144 always operates and thus the green light emitting device flashes,this causes disruption to users or other people and a waste of poweroccurs.

Accordingly, it is desirable that the heartbeat sensor 144 operates onlywhen it contacts a user's wrist or hand.

A method of reducing power consumption without disturbing users or otherpeople by operating the heartbeat sensor 144 in a specified situation isdescribed with reference to FIG. 19.

FIG. 19 is a flowchart illustrating a method of operating the heartbeatsensor 144 depending on whether a watch type device is worn according toan embodiment of the present invention.

Referring to FIG. 19, the control unit 180 of the watch type device 100checks whether the RMD signal outputted from the acceleration sensor 143is “1” in operation S341.

If the RMD signal is not “1”, that is, the RMD signal is “0”, thecontrol unit 180 of the watch type device 100 checks whether the AMDsignal is “0” in operation S349.

If the AMD signal is “0”, the control unit 180 of the watch type device100 determines it as not-wearing (that is, the first mode) in operationS351 and turns off both the light emitting unit 225 and the lightreceiving unit 227 of the heartbeat sensor 144 in operation S353.Accordingly, since power is not applied to both the light emitting unit225 and the light receiving unit 227 of the heartbeat sensor 144, greenlight is not generated from the light emitting unit 225 and the lightreceiving unit 227 may not receive light.

When the AMD signal is “1”, the control unit 180 of the watch typedevice 100 checks whether the AMD signal of “1” is maintained for morethan 4 sec in operation S343. Herein, 4 sec is one exemplary thresholdvalue for convenience of description and such a threshold value may varyaccording to a manufacturer or a user.

If the AMD signal of “1” is maintained for more than 4 sec, the controlunit 180 of the watch type device 100 determines it as wearing (that is,the second or third mode) in operation S345 and activates the heartbeatsensor 144 to turn on both the light emitting unit 225 and the lightreceiving unit 227 of the heartbeat sensor 144 in operation S347.Accordingly, since power is applied to both the light emitting unit 225and the light receiving unit 227 of the heartbeat sensor 144, greenlight is generated from the light emitting unit 225 and the lightreceiving unit 227 receives light so that when a user's hand or wristcontacts the heartbeat sensor 144, a touch interrupt signal may begenerated from the heartbeat sensor 144.

Accordingly, in a not-wearing state, the heartbeat sensor 144 does notoperate so that it is prevented that light is generated unnecessarily todisturb users or surrounding users and power is wasted.

A function that is currently executed in the second mode (or wristwearing) or the third mode (or hand gripping) may change into anotherfunction execution by a gesture of the watch type device 100, forexample, a tilt gesture. The tilt gesture may be a rotation movementclockwise or counter-clockwise or may be a horizontal movement in ahorizontal direction or a vertical direction.

For example, when the watch type device 100 is worn on a user's wrist,the analog watch screen (see FIG. 16B) may be displayed. In such a case,as shown in FIG. 20A, when a tilt gesture for the watch type device 100is inputted, an analog watch screen is changed into a home screenincluding a plurality of icons and displayed.

For example, when the watch type device 100 is gripped by a user's hand,the black screen (see FIG. 16A) may be displayed. In such a case, asshown in FIG. 20B, when a tilt gesture for the watch type device 100 isinputted, the current screen may be changed into a standby screen suchas the analog watch screen (see FIG. 16B), the digital watch screen (seeFIG. 16C), or a home screen including a plurality of icons anddisplayed.

Each time a tilt gesture is inputted, the standby screen may be changedinto a predetermined function. For example, when a first tilt gesture isinputted, the most recently received phone number is displayed and whena second tilt gesture is inputted, a call signal is transmitted to thedisplayed phone number so that it is possible to make a call with theother party of the phone number.

FIG. 21 is a flowchart illustrating a lock releasing method depending onwhether a watch type device is worn according to an embodiment of thepresent invention.

Referring to FIG. 21, the control unit 180 of the watch type device 100checks whether the watch type device 100 is worn on a wrist in operationS361.

As mentioned above, when the RMD signal outputted from the accelerationsensor 143 is “1”, it is determined that the watch type device 100 isworn and in more detail, the heartbeat sensor 144 may operate in orderto determine whether the watch type device 100 is gripped by a hand orworn on a wrist. By comparing a touch interrupt signal generated fromthe heartbeat sensor 144 with predetermined setting information, it isdetermined whether the watch type device 100 is worn on a wrist.

When it is determined as wrist wearing, the control unit 180 of thewatch type device 100 checks a lock state in operation S363.

When the watch type device 100 is not lock-released at least once afterit is worn on a wrist, the control unit 180 of the watch type device 100may maintain a lock state. In such a case, the control unit 180 of thewatch type device 100 executes a lock state mode to display a lockscreen on the display unit 151.

When a lock release command is inputted from a user, the watch typedevice 100 executes lock release to display a standby screen on thedisplay unit 151 in operation S365. The standby screen may include ananalog watch screen, a digital watch screen, or a home screen includinga plurality of icons.

As one example, when knock code inputted on a lock screen corresponds topredetermined knock code, a lock state may change into a lock releasestate.

As another example, a touch interrupt signal of the heartbeat sensor144, which is measured from a user's wrist, corresponds to apredetermined touch interrupt signal, a lock state may change into alock release state.

If a lock release is failed predetermined times, a lock screen may be nolonger displayed and an input screen for inputting pin code may bedisplayed. A pin code for lock release is set in advance and when a pincode corresponding to a predetermined pin code is inputted from a userthrough the input screen, lock may be released.

The control unit 180 of the watch type device 100 checks whether wristwearing is released in operation S367.

For example, when the AMD signal outputted from the acceleration sensor143 is “0” or when a touch interrupt signal having a signal variationand a bias is not generated from the heartbeat sensor 144, the controlunit 180 of the watch type device 100 may recognize that wrist wearingis released.

When wrist wearing is released, the control unit 180 of the watch typedevice 100 may change a lock release state into a lock state inoperation S369. When wrist wearing is released, every time a screen isturned on, a lock screen may be displayed on the display unit 151. Aswrist wearing is released, even if a lock state is released on a lockscreen, if a screen is turned on again after turned off, the lock screenmay be displayed.

As shown in FIG. 21, a lock release method may vary according to anot-wearing state and a wearing state.

TABLE 2 Wearing Not-wearing Lock state --> release state Knock codeKnock code Lock release state --> lock state N/A Move to ambient mode orsleep mode

As shown in Table 2, a lock state may change into a lock release stateby using a knock code during both wearing and not-wearing.

If lock is released once while wearing, even when a standby screen ischanged into a black screen or an ambient screen with less powerconsumption, it does not change into a lock state after one time lockrelease.

For example, a knock code command is inputted on an ambient screen in alock state during wearing, a lock state is changed into a lock releasestate and lock is released. As shown in FIG. 16B, an ambient screen maybe changed into a standby screen such as a watch screen and isdisplayed. Since the brightness of a standby screen is higher than thatof an ambient screen, power consumption in the standby screen is greaterthan that in the ambient screen.

As shown in FIG. 22A, after a predetermined time elapses, if no gestureis inputted to a standby screen that is lock-released by using a knockcode, as shown in FIG. 22B, a standby screen for reducing powerconsumption may be changed into an ambient screen. At this point, theambient screen may be in a lock release state instead of a lock state.In such a case, when a double tap for the ambient screen is inputted, asshown in FIG. 16B, the ambient screen is immediately changed into astandby screen and displayed. In such a manner, a function that lock isreleased according to an input of a double tap gesture is referred to asa knock on function.

On the other hand, even when lock is released once during not-wearing,if a standby screen is changed into a black screen or an ambient screen,it is changed into a lock state so that lock release may be performed byusing a knock code again.

On the other hand, a detection amount of a touch interrupt signal of theheartbeat sensor 144 varies according to a user's color skin.

As shown in FIG. 23, in comparison to the white people 505 or the yellowpeople 501, it shows that a detection amount of a touch interrupt signalof the black people 503 is significantly low. This is because asignificant amount of light from a light emitting device of theheartbeat sensor 144 is absorbed by the skin of the black people 503.

In such a case, on the basis of the same threshold value, in the case ofthe white people 505, a detection amount of a touch interrupt signalexceeds a threshold value and this is determined as wearing but in thecase of the black people 503, a detection amount of a touch interruptsignal is less than a threshold value and this is determined asnot-wearing. As a result, heartbeat measurement errors may occur.

A method of accurately measuring a touch interrupt signal regardless ofa user's skin color is described.

FIG. 24 is a flowchart illustrating a heartbeat measurement methodaccording to a skin in a watch type device according to an embodiment ofthe present invention.

Referring to FIG. 24, the control unit 180 of the watch type device 100performs a control on the heartbeat sensor 144 in order to detect asample signal from the heartbeat sensor 144 in operation S371. Thesample signal may be a plurality of pulse lights that are periodicallyemitted from the light emitting unit 225 of the heartbeat sensor 144.For example, first to third pulse lights are generated periodically fromthe light emitting unit 225 and are reflected by a user's skin to bedetected as first to third sample signals by the light receiving unit227.

The control unit 180 of the watch type device 100 calculates a detectionamount of a sample signal and checks whether the detection amount isgreater than a threshold value in operation S373. The threshold valuemay be set by a user or a manufacturer.

If the detection amount of a sample signal is greater than the thresholdvalue, the control unit 180 of the watch type device 100 recognizes thatthere is no error in a detection capability of the heartbeat sensor 144and thus performs a control on the heartbeat sensor 144 to measure atouch interrupt signal in operation S375.

If the detection amount is less than the threshold value, the controlunit 180 of the watch type device 100 performs a control on theheartbeat sensor 144 to increase a driving current of the light emittingunit 225 included in the heartbeat sensor 144 in operation S377. Thatis, the control unit 180 of the watch type device 100 increases adriving current of the light emitting unit 225 by increasing the powerapplied to the light emitting unit 225 included in the heartbeat sensor144. Accordingly, the amount of light generated from the light emittingunit 225 may be increased. The increased amount of light may bereflected by a user's skin and detected as a sample signal by the lightreceiving unit 227. If the detection amount of a sample signal is lessthan a threshold value, the method proceeds to operation S377 so that adriving current of the light emitting unit 225 may be increased. Such anoperation may be repeated until the detection amount of a sample signalbecomes greater than a threshold value.

Hereinafter, various user interfaces using the acceleration sensor 143and the heartbeat sensor 144 are described.

FIG. 25 is a screen view according a detailed setting of wearingdetection.

As shown in FIG. 25A, a wrist wearing detection and a hand wearingdetection may be displayed on a setting screen and a selection commandfor one of them may be inputted.

If a selection command for wrist wearing detection is inputted, as shownin FIG. 25B, tilt and no tilt may be displayed and a selection commandfor one of them may be inputted.

If a selection command for tilt is inputted, as shown in FIG. 25C, time,message, or pedometer may be displayed and a selection command for oneof them may be inputted.

Accordingly, as shown in FIG. 25D, a screen according to tilt or no tiltin the wrist wearing detection or the hand wearing detection may be set.

For example, when the wrist wearing detection, the tilt, and the timeare selected and set, as a tilt gesture is inputted in a state ofwearing the watch type device 100 on a wrist, a screen having a watchmay be displayed on the display unit 151 of the watch type device 100.

When a selection command for no tilt is inputted, a screen according tono tilt in the wrist wearing detection may be set.

In such a case, when wrist wearing is detected, even if no tilt gestureis inputted, a predetermined screen, for example, an analog watchscreen, may be displayed on the display unit 151.

FIG. 26 is a screen view illustrating a message checking method in ahand gripping state.

In a not-wearing state, when a screen of the watch type device 100 isturned on, for example, an analog watch screen may be displayed.

When the watch type device 100 is gripped by a hand, an analog watchscreen may be displayed.

In such a case, if there is a missed message, a text notification“missed message” may be displayed on the display unit 151.

In such a case, if a tilt gesture for the watch type device 100 isinputted as shown in FIG. 26a in a state where the watch type device 100is gripped by a user's hand, source information of a missed message maybe displayed. The source information may include numbers, characters,images, or icons representing text message, SNS, e-mail, and so on.

As another example, while the screen of the watch type device 100 isdisplayed as a black screen in a not-wearing state, if a user grips thewatch type device 100, this is recognized so that the screen of thewatch type device 100 may be changed from the black screen into ananalog screen. At this point, since source information of a missedmessage in addition to the analog screen may be displayed, a tiltgesture is not required.

As shown in FIG. 26B, when a knock code command is inputted on a screen,as shown in FIG. 26C, detailed content of the source may be displayed.

A knock code refers to a technique for dividing a screen into aplurality of areas and matching each area with a number in order torelease a lock state with a number combination corresponding to an areathat a user selects.

For example, when three source information is displayed, if a knock codecommand is inputted, detailed content of first received sourceinformation among the three source information is displayed and eachtime a tilt gesture is inputted, detailed content of the next receivedsource information may be displayed.

As another example, without displaying source information of a missedmessage by an input of a tilt gesture, detailed information of a missedmessage may be displayed by an input of a knock code command for astandby screen.

FIG. 27 is a screen view illustrating a message checking method in awrist wearing state.

It is assumed that the message checking method of FIG. 27 relates a casethat lock is released once in a wrist wearing state.

As shown in FIG. 27A, if there is no specific gesture for apredetermined time after lock is released once in a state where thewatch type device 100 is worn on a wrist, a standby screen may bechanged into an ambient screen and displayed. Since the background of anambient screen has a lower grayscale brightness than the background of astandby screen, power consumption may be reduced further in the ambientscreen than the standby screen. Both the ambient screen and the standbyscreen may include an analog watch.

As shown in FIG. 27b , when a tilt gesture for the watch type device 100is inputted, an ambient screen is changed into a standby screen anddisplayed. Furthermore, specific information may be displayed on thechanged standby screen. The specific information may be provided from aspecific content provider but the present invention is not limitedthereto. For example, the specific information may include travelinformation and shopping mall information.

As shown in FIG. 27C, as the heartbeat sensor 144 operates, a heartbeatsignal may be detected and user authentication may be performed by theheartbeat signal. In such a case, entire content of specific informationmay be displayed on a screen.

When user authentication using a heartbeat signal is successful, asshown in FIG. 27D, detailed content of specific information may bedisplayed.

FIG. 28 is a screen view illustrating a setting screen displaying methodin a wearing state.

In a not-wearing state, a black screen may be displayed on the displayunit 151 (see FIG. 16A). The not-wearing state may be a state where thewatch type device 100 is disposed in a specific place.

When a not-wearing state becomes a wearing state, a black screen may bechanged into a standby screen and displayed. In such a case, since poweris not supplied to the display unit 151, power consumption does notoccur.

Although a standby screen including hands, dials, and a background isshown in the drawing, the present invention is not limited thereto.

In order for a user to set a specific function, when tap or flick touchis inputted for a specific area of a standby screen, for example, hands,dials, and a background, as shown in FIG. 28, the standby screen may bechanged into a setting screen and displayed. For example, flick touchmay be inputted from the 12 o'clock dial to the center area of thestandby screen but the present invention is not limited thereto.

A specific function may be set by using heat, connectivity, and securityincluded on the setting screen.

FIG. 29 is a screen view illustrating a method of setting heat displayedon a setting screen in a wearing state.

In a wearing state, a standby screen may be displayed.

In such a case, when tap or flick touch for a specific area of a standbyscreen is inputted from a user, as shown in FIG. 29A, a setting screenincluding heat, security, and connectivity may be displayed. Forexample, flick touch may be inputted from the 12 o'clock dial to thecenter area of the standby screen but the present invention is notlimited thereto.

When a selection command for heat is inputted from a user, as shown inFIG. 29B, a heat user interface (heat UI) and a heat control may bedisplayed.

The heat UI may relates to a method of controlling heat by using a UIand the heat control may relate to a method of controlling heatsystematically.

Low temperature burns have become an issue recently. Low temperatureburns refer to burns occurring when a user is exposed to more than awarm temperature for a long time instead of a high temperature causing apain to a user. Especially, in comparison to high temperature burns, lowtemperature burns cause burns further deep inside a skin and are moredangerous than high temperature burns.

As shown in FIG. 30, the heating temperature of the rear of the watchtype device 100 is higher than that of the front. The heatingtemperature of the rear is drastically increased as the watch typedevice 100 operates, and then exceeds 40° C. after 30 min.

Accordingly, if a user is exposed for a long time at a heatingtemperature of more than 40° C., a user is most likely to be damaged bylow temperature burns.

FIG. 31 is a screen view illustrating a pop-up message notifying methodaccording to heating temperature.

When the watch type device 100 is in a not-wearing state and its heatingtemperature is greater than a predetermined heating temperature, forexample, 40° C., one of a charging stop message, a power off alarmmessage, and a power off message may be displayed.

On the other hand, as shown in FIG. 31A, when the watch type device 100is in a wearing state and its heating temperature is greater than apredetermined heating temperature, for example, 40° C., as shown in FIG.31B, a heat alarm message may be displayed.

If the watch type device 100 is in a wearing state continuously, a guidemessage “low temperature burns may occur if keeping an existing statecontinuously” may be displayed.

As another example, when a drag touch to a specific direction isinputted for the heat alarm message shown in FIG. 31B, a guide messagemay be displayed.

When the watch type device 100 is in a wearing state continuously, oneof a charging stop message, a power off alarm message, and a power offmessage may be displayed.

Moreover, when a selection command for heat UI is inputted (see FIG.29B), a background color and a circle indicator may be displayed.

If a selection command for a background color is inputted in order toset the background color, as shown in FIG. 32, a different backgroundcolor may be displayed according to a heating temperature.

For example, as shown in FIG. 31A, when a heating temperature of thewatch type device 100 is less than a predetermined heating temperature,for example, 35° C., the background of a screen displayed on the displayunit 151 may have white color or black color 520.

When a heating temperature of the watch type device 100 is increased andis greater than 35° C. and less than 45° C., as shown in FIG. 32B, thebackground of the screen may be changed from white color or black color520 to yellow color 522 and displayed.

When a heating temperature of the watch type device 100 is increased andis greater than 45° C., as shown in FIG. 32C, the background of thescreen may be changed from yellow color 522 to red color 524 anddisplayed.

When a screen having a background of red 524 is displayed, it may give awarning to a user by sound or vibration.

Herein, 35° C. is a first setting heating temperature and 45° C. is asecond setting heating temperature. 35° C. and 45° C. are just examplesand such a setting heating temperature may vary according to a user or amanufacturer.

If a selection command for a circle indicator is inputted in order toset the circle indicator (see FIG. 29), as shown in FIG. 33, a differentbackground color may be displayed according to a heating temperature.

For example, as shown in FIG. 33A, when a heating temperature of thewatch type device 100 is less than a predetermined heating temperature,for example, 35° C., no indicator is displayed at the frame of a screendisplayed on the display unit 151.

When a heating temperature of the watch type device 100 is increased andis greater than 35° C. and less than 45° C., as shown in FIG. 33B, atleast one indicator 526, which is spaced apart from each other along theframe of a screen and has yellow color, may be displayed. At least oneindicator 526 may have yellow color.

When a heating temperature of the watch type device 100 is increased andis greater than 45° C., as shown in FIG. 33C, at least one indicator528, which is spaced apart from each other along the frame of a screenand has red color, may be displayed.

That is, while an indicator is not displayed on a screen, if a heatingtemperature of the watch type device 100 is greater than 35° C., anindicator 526 with yellow color may be displayed and if a heatingtemperature of the watch type device 100 is greater than 45° C., anindicator 528 of which color is changed from yellow to red may bedisplayed.

When a screen having a red indicator 528 is displayed, it may give awarning to a user by sound or vibration.

FIG. 34 is a screen view illustrating a method of lowering a heatingtemperature according to a heat control set in FIG. 29.

When a screen having the red indicator 528 by a heating temperature ofmore than 45° C. is displayed, as shown in FIGS. 34A and 34B, a settingfor lowering such a heating temperature may be required.

For example, when a drag touch is inputted from the red indicator 528 tothe center area of a screen (see FIG. 33C), as shown in FIG. 34A, aplurality of applications Application 1 and Application 2 and a systemsetting may be displayed.

If a selection command for system setting is inputted, as shown in FIG.34B, Wi-Fi, Bluetooth, and Brightness may be displayed. According to anadditional input of a selection command of a user, Wi-Fi and Bluetoothmay be set to be activated (or ON) or deactivated (or OFF) or a level ofbrightness may be changed into a low level.

Moreover, when a selection command for a specific application (forexample, Application 1) is inputted, a window for checking the deletionof the specific application may be displayed. When a selection commandfor the deletion is inputted, the specific application may be deleted.

FIG. 35 is a screen view illustrating a method of setting securitydisplayed on a setting screen in a wearing state.

When a selection command for security is inputted from a user (see FIG.28), as shown in FIG. 35, Knock code and Knock ON may be displayed.

As mentioned above, Knock code refers to a technique for dividing ascreen into a plurality of areas and matching each area with a number inorder to release a lock state with a number combination corresponding toan area that a user selects.

Knock ON refers to a gesture of knocking a screen twice.

FIG. 36 is a screen view illustrating a subsequent setting method whenKnock On is selected in FIG. 35.

When a selection command for Knock ON is inputted (see FIG. 35), asshown in FIG. 36, a window for checking whether to turn off a lockscreen when a wearing state is maintained may be displayed.

If it is set to turn off a lock screen, as the watch type device 100 isworn and lock is released once, after that, a predetermined specificscreen may be displayed immediately without an additional lock releaseprocess. The specific screen may be an ambient screen or a standbyscreen.

This is described in more detail with reference to FIG. 37.

FIG. 37 is a flowchart illustrating a screen activating method and alock releasing method according to wearing.

Referring to FIG. 37, the control unit 180 of the watch type device 100checks whether the watch type device 100 is worn in operation S381.Herein, the wearing refers to wearing the watch type device 100 by awrist instead of gripping the watch type device 100 by a hand.

If it is determined that the watch type device 100 is in a not-wearingstate, the control unit 180 of the watch type device 100 displays ablack screen on the display unit 151 in operation S382.

In relation to the black screen, power is not applied to the displayunit 151 and thus power is not consumed.

When a Knock ON function is executed on a black screen in order toswitch to an ambient screen or a standby screen, that is, double tap forthe black screen is inputted, a lock screen may be displayed on a watchscreen in operation S383. A lock pattern 530 may be displayed on thelock screen.

Once a gesture for lock release is inputted from a user, if the inputtedgesture corresponds to a predetermined pattern, lock is released so thatan ambient screen or a standby screen may be displayed.

If it is determined that the watch type device 100 is in a wearingstate, the control unit 180 of the watch type device 100 displays ablack screen on the display unit 151 in operation S384.

When a Knock ON function is executed on a black screen in order toswitch to an ambient screen or a standby screen, that is, double tap forthe black screen is inputted, the control unit 180 of the watch typedevice 100 checks whether there is a lock release event of at least onetime previously in a wearing state in operation S385.

If there is a lock release event of at least one time previously in awearing state on the basis of a check result, without an additional lockrelease process, a watch screen and a home screen including icons on thewatch screen may be displayed to overlap each other in operation S386.At this point, icons of a home screen may be changed from a transparentstate into an opaque state.

If a selection command for a home screen is inputted by a user, a watchscreen may disappear and only the home screen may be displayed. Forexample, a selection command for a home screen may be a tilt gesture butthe present invention is not limited thereto.

If there is no lock release event of at least one time previously in awearing state, a lock screen having a lock pattern 530 may be displayedon a watch screen in operation S387.

Once a gesture for lock release is inputted from a user, if the inputtedgesture corresponds to a predetermined pattern, lock is released so thatan ambient screen or a standby screen may be displayed.

Although not shown in the drawing, a user authentication by a heartbeatsignal using the heartbeat sensor 144 may be used.

For example, if lock has been released before, a user authentication bya heartbeat signal may be used instead of double tap. Userauthentication may take about 3 sec. When double tap is inputted duringuser authentication, regardless of whether the user authentication issuccessful, an ambient screen or a standby screen may be displayedimmediately.

As another example, if lock is never released before, a lock releaseusing a user authentication by heartbeat signal and a lock pattern maybe used. In such a case, the user authentication by heartbeat signal maybe performed before double tap is inputted or may be performed togetherwhen double tap is inputted but the present invention is not limitedthereto.

A method of displaying a standby screen by lock release duringnot-wearing is described with reference to FIG. 37.

Referring to FIG. 37, when the watch type device 100 is not worn by auser (that is, not-wearing), if a double tap (for example, knock on) fora black screen in operation S382 is inputted, a lock screen having alock pattern 530 in operation S383 may be displayed.

When a lock release command using lock pattern is inputted, a homescreen including a plurality of icons 532 may be displayed as a standbyscreen. Instead of the home screen, an analog watch screen or a digitalwatch screen may be displayed.

Accordingly, a black screen where no power is applied by a touch tapinput and a lock release may be changed into an activated standbyscreen.

If a predetermined time elapses, the displayed standby screen may bechanted into a black screen and displayed.

In such a case, in order to change to the standby screen again, a doubletap input process in operation S382 and a lock release process inoperation S383 need to be performed.

That is, each time a standby screen is changed into a black screenduring not-wearing, in order to change the changed black screen into thestandby screen, a lock release process needs to be performed each time.

When a user does not have the watch type device 100 in the user's handduring not-wearing, this makes security vulnerable. Therefore, bydisplaying a standby screen each time through lock release, the securityduring not-wearing may be enhanced.

Hereinafter, a method of displaying a standby screen by first lockrelease during wearing is described with reference to FIG. 37.

Referring to FIG. 37, when the watch type device 100 is worn by a user,that is, when it is worn on a wrist or gripped by a hand, a black screenmay be displayed on the display unit 151 in operations S381 and S384.

When double tap for a black screen displayed in operation S384 isinputted, a lock screen having a lock pattern in operation S387 may bedisplayed.

When a lock release command using lock pattern is inputted, an analogwatch screen may be displayed as a standby screen. Instead of the analogwatch screen, a digital watch screen or a home screen may be displayed.

Although not shown in the drawing, when the watch type device 100 isworn by a user, that is, when it is worn on a wrist or gripped by ahand, instead of the black screen in operation S384, the lock screen inoperation S387 may be immediately displayed. Accordingly, a double tapinput process for activating the black screen as the standby screen maybe omitted.

Although not shown in the drawing, user authentication by a heartbeatsignal using the heartbeat sensor 144 may be performed before double tapinput or may be performed simultaneously with double tap input. In sucha way, as user authentication using the heartbeat sensor 144 is added,the security may be further enhanced.

As above, during a first lock release, a lock may be released by using alock pattern on a lock screen.

Hereinafter, a method of displaying a standby screen by after first lockrelease during wearing is described with reference to FIG. 37.

If a predetermined time elapses, an analog watch screen that islock-released first and displayed is changed into a black screen forreducing power consumption and displayed.

In such a case, when double tap for a black screen is inputted, ananalog watch screen may be displayed as a standby screen.

That is, if lock is released at least once during wearing, without alock releasing process after that, each time double tap is inputted froma user, a black screen may be changed into a standby screen at any time.Accordingly, the trouble of releasing the lock each time a black screenis changed into a standby screen during wearing may be eliminated.

FIG. 38 is another flowchart illustrating a screen activating method anda lock releasing method according to wearing.

Referring to FIG. 38, unlike FIG. 37, a method of releasing a lock byusing knock code instead of a lock screen in operation S383 isdescribed.

In a not-wearing state, a black screen having a displayed knock codearea 557 may be displayed on the display unit 151 in operation S388.

A standby screen such as a home screen may be displayed in operationS389 through lock release by using a plurality of knock code areas 557that are virtually allocated on the black screen.

Although lock is released using knock code and a standby screen isdisplayed, after a predetermined time elapses, the standby screen may bechanged into a black screen or an ambient screen again and also a lockrelease state may be changed into a lock state. Accordingly, in orderfor lock release again, a lock release process using knock code needs tobe performed.

It is illustrated that a knock code area is visible to the naked eye butactually, it is not visible to the naked eye. Accordingly, a user mayrelease a lock by touching a black screen in the order that a userpresets.

Instead of the home screen, an analog watch screen, a digital watchscreen, or another type of a standby screen may be displayed.

FIG. 39 is a screen view illustrating a method of releasing lock byusing a heartbeat signal.

As shown in FIG. 39A, when a black screen 532 is displayed, if a user'shand or wrist contacts the heartbeat sensor 144 of the watch type device100, a heartbeat signal may be generated from the heartbeat sensor 144.

The generated heartbeat signal 536 may be displayed at the frame of theblack screen 532. That is, when recognizing the contact of a user's handor wrist, the control unit 180 of the watch type device 100 may performa control to operate the heartbeat sensor 144. In such a way, whenrecognizing the contact of a user's hand or wrist, the control unit 180of the watch type device 100 allocates the frame of the black screen 532as the heartbeat display area 534. The generated heartbeat signal 536may be displayed on the allocated heartbeat display area 534.

When the generated heartbeat signal 536 is within a predetermined range,the control unit 180 of the watch type device 100 releases a lock, andchanges the black screen 532 into a standby screen and displays it.

The predetermined range may vary according to each user. Accordingly, asetting range that a user of the watch type device 100 registerspreviously may be the unique identifier of the user of the watch typedevice 100.

If the generated heartbeat signal 536 is out of a predetermined range(see FIG. 39B) or no heartbeat signal is displayed in the heartbeatdisplay area 534 because no heartbeat signal is generated, lock is notreleased.

Moreover, when a selection command for security is inputted (see FIG.28), knock code or knock on may be displayed.

When a selection command for knock code is inputted, a knock codegesture may be displayed.

It may be set to activate a knock code gesture by an ON selectioncommand for the knock code gesture.

A method of utilizing a knock code gesture is described with referenceto FIG. 40.

FIG. 40 is a screen view illustrating a method of utilizing a knock codegesture.

As shown in FIG. 40a , a plurality of gesture bars 541, 543, 545, and547 may be displayed at the frame of the screen 540.

For example, when touch and drag from the first gesture bar 541 towardthe center of the screen 540 is inputted from a user, an internetbrowser application is executed so that a predetermined webpage may bedisplayed on the display unit 151.

As shown in FIG. 40B, when touch and drag from the second gesture bar543 toward the center of the screen 540 is inputted from a user, a watchapplication is executed so that a watch screen may be displayed on thedisplay unit 151.

As shown in FIG. 40C, when touch and drag from the third gesture bar 545toward the center of the screen 540 is inputted from a user, a phoneapplication is executed so that a phone initial screen may be displayedon the display unit 151.

As shown in FIG. 40C, when touch and drag from the fourth gesture bar547 toward the center of the screen 540 is inputted from a user, asetting application is executed so that a setting initial screen may bedisplayed on the display unit 151.

FIG. 41 is a screen view illustrating a method of changing dials in awearing state.

A watch screen of the watch type device 100 may include hands 553representing hour and minute hands, dials 551 representing time numbers,and a background 555.

For example, when touch and hold is inputted for a predetermined time,for example, several sec, for a specific dial 551 as shown in FIG. 41Aand rotation drag is inputted clockwise or counter-clockwise along anarea where the dial 551 is disposed, that is, the frame area of thewatch screen as shown in FIG. 41B, the current dial form may be changedinto another dial form as shown in FIG. 41C.

Each time rotation drag is inputted clockwise or counter-clockwise, thecurrent dial form may be changed into another dial form. At this point,the changed dial form is not yet set as the dial of a watch screen.

Accordingly, an additional gesture may be inputted in order to set thechanged dial form as the dial of a watch screen.

For example, in the case of setting a dial form, after touching anarbitrary point of a dial form shown in FIG. 41C, drag is inputted inone direction shown in FIG. 41D, for example, from the center area of awatch screen to the 3 o'clock direction, as shown in FIG. 41E, thechanged dial form is applied to the hands 553 and the background 555 sothat a fixed watch screen may be displayed. Accordingly, the dial formof FIG. 41A may be changed into the dial form of FIG. 41E.

Without a drag operation according to one direction shown in FIG. 41D,the changed dial form is applied to the hands 553 and the background 555immediately by a touch operation on an arbitrary point shown in FIG. 41Cso that a fixed watch screen may be displayed as shown in FIG. 41E.

Although not shown in the drawing, the above-described dial changingmethod is identically applied so that the hands 553 or the background555 may be changed.

On the other hand, in a wearing state, without an additional lockrelease process, a simple specific user interface may be executed by aspecific gesture.

For example, when double tap for a black screen is inputted, without alock release process, the black screen may be changed into a standbyscreen such as a watch screen immediately and displayed.

For example, when rotation drag touch is inputted along one side of theframe 558 of a black screen, without a lock release process, an internetbrowser application may be immediately displayed, or an internet browserapplication may be executed so that a predetermined webpage is displayedon the display unit 151.

For example, when rotation drag touch is inputted along the other sideof the frame 559 of a black screen, without a lock release process, asetting application may be displayed, or a setting application may beexecuted so that a predetermined webpage may be displayed on the displayunit 151.

Since the watch type device 100 is always present within a user's viewin a wearing state, in comparison to a not-wearing state, the securitylevel may be low. Accordingly, in a wearing state, without an additionallock release process, a corresponding user interface may be executedimmediately by a specific gesture.

FIG. 42 is a screen view illustrating a method of setting connectivityaccording to a wearing state.

When a selection command for connectivity is inputted from a user (seeFIG. 28), as shown in a FIG. 42, a setting screen of auto connectivityaccording to a wearing state may be displayed.

The setting screen may include a setting button for auto connectivitywhen wearing, a setting button for auto connectivity when taking off,and a setting button for auto data upload when taking off. When thesesbuttons are selected, auto conductivity when wearing and autoconnectivity when taking off may be set. Herein, the taking off refersto taking off the watch type device 100 from a wrist.

FIG. 43 is a screen view illustrating a screen displaying method when awatch type device is taken off.

As shown in FIG. 43, when auto connectivity is set when taking off, assoon as the watch type device 100 is taken off from a user's wrist,without an additional gesture, the type of the currently activatedconnectivity may be displayed on the display unit 151. The type ofconnectivity may include Wi-Fi, Bluetooth, and NFC. According to aselection command from a user, Wi-Fi, Bluetooth, and NFC in currentlyactivation may be set to deactivation.

After taking off a watch type device, as Wi-Fi is activatedcontinuously, the present invention may prevent current consumptioncontinuously.

Although not shown in the drawing, when auto connectivity is set whenwearing, as soon as the watch type device 100 is taken off from a user'swrist, without an additional gesture, the connectivity types may bedisplayed on the display unit 151. When a selection command for at leastone of the connectivity types is inputted, the selected at least oneconnectivity type may be activated. For example, a selection command forBluetooth is inputted from a user, Bluetooth is activated in order toexecute a Bluetooth function.

Auto update setting when taking off refers to a setting for performingseries of processes to update data or information of the watch typedevice 100 to another terminal when the watch type device 100 is takenoff from a user's wrist.

The other terminal may include a wireless communication system, anotherwatch type device 100, a user's mobile terminal, another user's mobileterminal, an external server, a desktop computer, a notebook computer,and a television.

In the case of auto data upload when taking off, when the watch typedevice 100 is taken off from a user's wrist, as shown in FIG. 44, dataitems to be uploaded to another terminal may be displayed as a pop-upwindow. As soon as data items are displayed as a pop-up window, data ofcorresponding data items may be uploaded into a predetermined anotherterminal.

FIG. 45 is a view illustrating a method of updating an update itemmanually.

When a selection command for connectivity is inputted, as shown in FIG.45A, a setting button for manual update after pop-up alarm when takingoff and a setting button for auto update when taking off.

In the case of manual update after pop-up alarm when taking off, whenthe watch type device 100 is taken off from a user's wrist, as shown inFIG. 45B, update items may be displayed.

When a selection command for a specific update item is inputted from auser, detailed data of a corresponding update may be displayed. Forexample, when a selection command for a gallery item is inputted, asshown in FIG. 45C, picture images may be displayed.

In order to update picture images, when a selection command for a savebutton 561 is inputted, for example, the picture images may be updatedin a gallery folder of the mobile terminal 560.

On the other hand, when taking off, update may be performedautomatically. In the case of a setting for auto update when taking off,when watch type device 100 is taken off from a user's wrist, updateitems, for example, may be updated to the mobile terminal 560.

The invention can also be embodied as computer readable codes on acomputer readable recording medium. The computer readable recordingmedium is any data storage device that can store data which can bethereafter read by a computer system. Examples of the computer readablerecording medium include magnetic storage media (e.g., ROM, floppydisks, hard disks, etc.) and optical recording media (e.g., CD-ROMs, orDVDs) and carrier waves (e.g., transmission through the Internet).Additionally, the computer may include the control unit 180 of the watchtype terminal 100. Accordingly, the detailed description is notconstrued as being limited in all aspects and should be considered asillustrative. The scope of the invention should be determined byreasonable interpretation of the appended claims, and all modificationswithin equivalent ranges of the present invention are included in thescope of the present invention.

Effects of a wearable device according to the present invention aredescribed as follows.

According to at least one of embodiments of the present invention, sincedetailed content of simple notification information can be checked bygripping a watch type device without wearing it, user's convenience maybe improved.

According to at least one of embodiments of the present invention, sincevarious states of a watch type device, especially, a hand grippingstate, are detected by using an acceleration sensor and a heartbeatsensor and a function according thereto is executed, user's conveniencemay be improved.

According to at least one of embodiments of the present invention, sincea heartbeat sensor does not operate before an acceleration sensordetects wearing, it is prevented that a heartbeat sensor operatesunnecessarily to disturb users or other people and power is wasted.

Additionally, according to at least one of embodiments of the presentinvention, since crosstalk phenomenon is completely removed by aheartbeat sensor including a layer with a partition disposed between alight emitting unit and a light receiving unit, heartbeat measurementerrors due to a crosstalk phenomenon may be prevented, so that themeasurement performance of a heartbeat sensor is enhanced and thereliability is improved.

Additionally, according to at least one of embodiments of the presentinvention, after taking off a watch type device, as Wi-Fi is activatedcontinuously, continuous current consumption may be prevented.

Although embodiments have been described with reference to a number ofillustrative embodiments thereof, it should be understood that numerousother modifications and embodiments can be devised by those skilled inthe art that will fall within the spirit and scope of the principles ofthis disclosure. More particularly, various variations and modificationsare possible in the component parts and/or arrangements of the subjectcombination arrangement within the scope of the disclosure, the drawingsand the appended claims. In addition to variations and modifications inthe component parts and/or arrangements, alternative uses will also beapparent to those skilled in the art.

What is claimed is:
 1. A wearable device comprising: a main body; adisplay located at a front side of the main body and configured todisplay information; a heartbeat sensor located below the display andlocated at a rear side of the main body and configured to detect aheartbeat using a light emitting unit and a light receiving unit; and acontroller configured to: display, on the display, a lock screenrepresenting a lock state; identify a wearing state of the wearabledevice and a non-wearing state of the wearable device using theheartbeat sensor, wherein the wearing state is identified when at leasta heartbeat of a user is detected via the heartbeat sensor; and changethe lock state of the wearable device to a lock released state of thewearable device in response to receiving of a lock release command afteridentifying that the wearable device is in the wearing state; display alock released screen if the display is turned on after the display isturned off while the wearable device is in the wearing state; change thelock state to the lock released state in response to receiving of thelock release command after identifying that the wearable device is inthe non-wearing state; and display the lock screen if the display isturned on after the display is turned off while the wearable device isin the non-wearing state.
 2. The wearable device of claim 1, wherein thenon-wearing state is identified when a heartbeat is not detected by theheartbeat sensor.
 3. The wearable device of claim 1, wherein theheartbeat sensor is not used when the non-wearing state is identified.4. The wearable device of claim 1, further comprising an accelerationsensor, wherein the non-wearing state is identified using theacceleration sensor.
 5. The wearable device of claim 1, furthercomprising an acceleration sensor, wherein the wearing state isdetermined using the heartbeat sensor and the acceleration sensor. 6.The wearable device of claim 1, wherein the lock released screen ischanged to a black screen after a predetermined time.
 7. The wearabledevice of claim 1, wherein the lock released screen includes an analogwatch screen, a digital watch screen, or a home screen including aplurality of icons.
 8. The wearable device of claim 1, wherein thecontroller is further configured to change the lock released screenincluding a watch screen to a home screen including a plurality of iconswhen a tilt gesture is received while in the wearing state.
 9. Thewearable device of claim 1, wherein: the lock release command isreceived at a code input screen while in the lock state, the code inputscreen including a plurality of areas which respectively correspond to anumber; and the controller is further configured to change the lockstate to the lock released state when a predetermined code is receivedat the code input screen.
 10. The wearable device of claim 1, wherein:the light emitting unit comprises at least one of an infrared lightemitting element, a red light emitting element, or a green lightemitting element, and is configured to emit a light; the light receivingunit is configured to receive the emitted light; and wherein thecontroller is further configured to detect the heartbeat based on anamount of the light received at the light receiving unit from the lightemitting unit.
 11. A wearable device comprising: a main body; a displaylocated at a front side of the main body and configured to displayinformation; a heartbeat sensor located at a rear side of the main bodyand configured to detect a heartbeat using a light emitting unit and alight receiving unit; and a controller configured to: display, on thedisplay, a lock state indicator; identify a wearing state of thewearable device and a non-wearing state of the wearable device using theheartbeat sensor, wherein the wearing state is identified when at leasta heartbeat of a user is detected by the heartbeat sensor; afteridentifying that the wearable device is in the wearing state, ceasedisplay of the lock state indicator in response to receiving of a lockrelease command, wherein the lock state indicator is not displayed ifthe display is turned on after the display is turned off while thewearable device is in the wearing state; and after identifying that thewearable device is in the non-wearing state, cease display of the lockstate indicator in response to receiving of the lock release command,wherein the lock state indicator is displayed if the display is turnedon after the screen of the display is turned off while the wearabledevice is in the non-wearing state.
 12. The wearable device of claim 11,wherein the non-wearing state is identified when a heartbeat is notdetected by the heartbeat sensor.
 13. The wearable device of claim 11,wherein the heartbeat sensor is not used when the non-wearing state isidentified.
 14. The wearable device of claim 11, further comprising anacceleration sensor, wherein the non-wearing state is identified usingthe acceleration sensor.
 15. The wearable device of claim 11, furthercomprising an acceleration sensor, wherein the wearing state isdetermined using the heartbeat sensor and the acceleration sensor. 16.The wearable device of claim 11, wherein a black screen is displayedafter a predetermined time after display of the lock state indicator isceased.
 17. The wearable device of claim 11, wherein an analog watchscreen, a digital watch screen, or a home screen including a pluralityof icons is displayed after display of the lock state indicator isceased.
 18. The wearable device of claim 11, wherein the controller isfurther configured to display a home screen including a plurality oficons when a tilt gesture is received while in the wearing state afterdisplay of the lock screen indicator is ceased.
 19. The wearable deviceof claim 11, wherein: the lock release command is received at a codeinput screen while the lock state indicator is displayed, the code inputscreen including a plurality of areas which respectively correspond to anumber; and the controller is further configured to cease display of thelock screen indicator when a predetermined code is received at the codeinput screen.
 20. The wearable device of claim 11, wherein: the lightemitting unit comprises at least one of an infrared light emittingelement, a red light emitting element, or a green light emittingelement, and is configured to emit a light; the light receiving unit isconfigured to receive the emitted light; and wherein the controller isfurther configured to detect the heartbeat based on an amount of thelight received at the light receiving unit from the light emitting unit.21. A wearable device comprising: a main body; a display located at afront side of the main body and configured to display information; aheartbeat sensor located below the display and located at a rear side ofthe main body and configured to detect a heartbeat using a lightemitting unit and a light receiving unit; and a controller configuredto: display, on the display, a lock screen representing a lock state;identify a wearing state of the wearable device and a non-wearing stateof the wearable device using the heartbeat sensor, wherein the wearingstate is identified when at least a heartbeat of a user is detected viathe heartbeat sensor; and change the lock state of the wearable deviceto a lock released state of the wearable device in response to receivingof a lock release command after identifying that the wearable device isin the wearing state; display a lock released screen if the display isturned on after the display is turned off while the wearable device isin the wearing state; change the lock state to the lock released statein response to receiving of the lock release command after identifyingthat the wearable device is in the non-wearing state; and display thelock screen if the display is turned on after the display is turned offwhile the wearable device is in the non-wearing state, wherein the lockreleased screen and the lock screen each include a watch screen, andwherein the controller is further configured to maintain the lock stateif the lock release command is not received while the wearable device isin the wearing state.